diff --git a/addons/auth_signup/views/res_users_views.xml b/addons/auth_signup/views/res_users_views.xml
index 02705599b8c..5e2383ccb48 100644
--- a/addons/auth_signup/views/res_users_views.xml
+++ b/addons/auth_signup/views/res_users_views.xml
@@ -38,11 +38,9 @@
             <field name="model">res.users</field>
             <field name="inherit_id" ref="base.view_users_tree"/>
             <field name="arch" type="xml">
-                <xpath expr="//tree" position="attributes">
-                    <attribute name="decoration-info">state == 'new'</attribute>
-                </xpath>
-                <xpath expr="//field[@name='login_date']" position="after">
-                    <field name="state" invisible="1"/>
+                <xpath expr="//field[@name='company_id']" position="after">
+                    <field name="state" widget="badge"
+                        decoration-info="state == 'new'" decoration-success="state == 'active'"/>
                 </xpath>
             </field>
         </record>
diff --git a/addons/auth_totp/views/res_users_views.xml b/addons/auth_totp/views/res_users_views.xml
index ba5e8f7ce6f..b9a95e5d9c7 100644
--- a/addons/auth_totp/views/res_users_views.xml
+++ b/addons/auth_totp/views/res_users_views.xml
@@ -8,7 +8,6 @@
             <xpath expr="//search" position="inside">
                 <separator/>
                 <filter name="totp_enabled" string="Two-factor authentication Enabled" domain="[('totp_secret','!=',False)]"/>
-                <separator/>
                 <filter name="totp_disabled" string="Two-factor authentication Disabled" domain="[('totp_secret','=',False)]"/>
             </xpath>
         </field>
diff --git a/addons/calendar/views/calendar_views.xml b/addons/calendar/views/calendar_views.xml
index be9f9066f65..400712cb5fb 100644
--- a/addons/calendar/views/calendar_views.xml
+++ b/addons/calendar/views/calendar_views.xml
@@ -346,7 +346,8 @@
             <field name="arch" type="xml">
                 <notebook colspan="4" position="inside">
                     <!-- Placeholder container to hold information about external accounts (Google calendar, Microsoft calendar, ...) -->
-                    <page string="Calendar" name="calendar" invisible="1" groups="base.group_system">
+                    <page string="Calendar" name="calendar" invisible="1" groups="base.group_system"
+                         attrs="{'invisible': [('share', '=', True)]}">
                         <group name="calendar_accounts"/>
                     </page>
                 </notebook>
diff --git a/addons/crm_livechat/tests/test_crm_lead.py b/addons/crm_livechat/tests/test_crm_lead.py
index c5736357338..31af9e1c956 100644
--- a/addons/crm_livechat/tests/test_crm_lead.py
+++ b/addons/crm_livechat/tests/test_crm_lead.py
@@ -16,14 +16,14 @@ class TestLivechatLead(TestCrmCommon):
             cls.env, login='user_anonymous',
             name='Anonymous Website', email=False,
             company_id=cls.company_main.id,
-            notification_type='inbox',
+            notification_type='email',
             groups='base.group_public',
         )
         cls.user_portal = mail_new_test_user(
             cls.env, login='user_portal',
             name='Paulette Portal', email='user_portal@test.example.com',
             company_id=cls.company_main.id,
-            notification_type='inbox',
+            notification_type='email',
             groups='base.group_portal',
         )
 
diff --git a/addons/im_livechat/views/res_users_views.xml b/addons/im_livechat/views/res_users_views.xml
index 0ded2190802..187b6a4bf24 100644
--- a/addons/im_livechat/views/res_users_views.xml
+++ b/addons/im_livechat/views/res_users_views.xml
@@ -9,7 +9,8 @@
             <field name="inherit_id" ref="base.view_users_form_simple_modif"/>
             <field name="arch" type="xml">
                 <xpath expr="//field[@name='tz']" position="after">
-                    <field name="livechat_username" string="Online Chat Name" readonly="0"/>
+                    <field name="livechat_username" string="Online Chat Name" readonly="0"
+                        attrs="{'invisible': [('share', '=', True)]}"/>
                 </xpath>
             </field>
         </record>
@@ -21,7 +22,8 @@
             <field name="inherit_id" ref="base.view_users_form"/>
             <field name="arch" type="xml">
                     <xpath expr="//group[@name='messaging']" position="after">
-                        <group name="livechat" string="Livechat">
+                        <group name="livechat" string="Livechat"
+                            attrs="{'invisible': [('share', '=', True)]}">
                             <field name="livechat_username"/>
                         </group>
                     </xpath>
diff --git a/addons/mail/models/res_users.py b/addons/mail/models/res_users.py
index 5c1b43c120b..2c24311836d 100644
--- a/addons/mail/models/res_users.py
+++ b/addons/mail/models/res_users.py
@@ -22,11 +22,25 @@ class Users(models.Model):
         ('email', 'Handle by Emails'),
         ('inbox', 'Handle in Odoo')],
         'Notification', required=True, default='email',
+        compute='_compute_notification_type', store=True, readonly=False,
         help="Policy on how to handle Chatter notifications:\n"
              "- Handle by Emails: notifications are sent to your email address\n"
              "- Handle in Odoo: notifications appear in your Odoo Inbox")
     res_users_settings_ids = fields.One2many('res.users.settings', 'user_id')
 
+    _sql_constraints = [(
+        "notification_type",
+        "CHECK (notification_type = 'email' OR NOT share)",
+        "Only internal user can receive notifications in Odoo",
+    )]
+
+    @api.depends('share')
+    def _compute_notification_type(self):
+        for user in self:
+            # Only the internal users can receive notifications in Odoo
+            if user.share or not user.notification_type:
+                user.notification_type = 'email'
+
     # ------------------------------------------------------------
     # CRUD
     # ------------------------------------------------------------
diff --git a/addons/mail/tests/__init__.py b/addons/mail/tests/__init__.py
index e1c33cc3fdf..e56729715bd 100644
--- a/addons/mail/tests/__init__.py
+++ b/addons/mail/tests/__init__.py
@@ -9,6 +9,7 @@ from . import test_mail_render
 from . import test_mail_template
 from . import test_mail_tools
 from . import test_res_partner
+from . import test_res_users
 from . import test_res_users_settings
 from . import test_rtc
 from . import test_update_notification
diff --git a/addons/mail/tests/test_res_users.py b/addons/mail/tests/test_res_users.py
new file mode 100644
index 00000000000..3dba356da83
--- /dev/null
+++ b/addons/mail/tests/test_res_users.py
@@ -0,0 +1,22 @@
+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from psycopg2 import IntegrityError
+
+from odoo.addons.mail.tests.common import MailCommon, mail_new_test_user
+from odoo.tools import mute_logger
+
+
+class TestUser(MailCommon):
+
+    @mute_logger('odoo.sql_db')
+    def test_notification_type_constraint(self):
+        with self.assertRaises(IntegrityError, msg='Portal user can not receive notification in Odoo'):
+            mail_new_test_user(
+                self.env,
+                login='user_test_constraint_2',
+                name='Test User 2',
+                email='user_test_constraint_2@test.example.com',
+                notification_type='inbox',
+                groups='base.group_portal',
+            )
diff --git a/addons/mail/views/res_users_views.xml b/addons/mail/views/res_users_views.xml
index a181a337c93..1b663a6c491 100644
--- a/addons/mail/views/res_users_views.xml
+++ b/addons/mail/views/res_users_views.xml
@@ -27,7 +27,8 @@
             <field name="arch" type="xml">
                 <data>
                     <field name="signature" position="before">
-                        <field name="notification_type" widget="radio"/>
+                        <field name="notification_type" widget="radio"
+                            attrs="{'invisible': [('share', '=', True)]}"/>
                     </field>
                 </data>
             </field>
diff --git a/addons/mail_bot/views/res_users_views.xml b/addons/mail_bot/views/res_users_views.xml
index e714ff6b438..2d56c986796 100644
--- a/addons/mail_bot/views/res_users_views.xml
+++ b/addons/mail_bot/views/res_users_views.xml
@@ -8,7 +8,8 @@
         <field name="arch" type="xml">
             <data>
                 <field name="notification_type" position="after">
-                    <field name="odoobot_state" readonly="0" groups="base.group_no_one"/>
+                    <field name="odoobot_state" readonly="0" groups="base.group_no_one"
+                        attrs="{'invisible': [('share', '=', True)]}"/>
                 </field>
             </data>
         </field>
@@ -22,7 +23,8 @@
         <field name="arch" type="xml">
             <data>
                 <field name="signature" position="before">
-                    <field name="odoobot_state" readonly="0" groups="base.group_no_one"/>
+                    <field name="odoobot_state" readonly="0" groups="base.group_no_one"
+                        attrs="{'invisible': [('share', '=', True)]}"/>
                 </field>
             </data>
         </field>
diff --git a/addons/website_blog/tests/common.py b/addons/website_blog/tests/common.py
index d23691e9d07..e38f906d904 100644
--- a/addons/website_blog/tests/common.py
+++ b/addons/website_blog/tests/common.py
@@ -32,7 +32,7 @@ class TestWebsiteBlogCommon(common.TransactionCase):
             'name': 'Cedric Public',
             'login': 'cedric',
             'email': 'cedric.public@example.com',
-            'notification_type': 'inbox',
+            'notification_type': 'email',
             'groups_id': [(6, 0, [group_public_id])]
         })
 
diff --git a/addons/website_blog/tests/test_website_blog_flow.py b/addons/website_blog/tests/test_website_blog_flow.py
index ebd7c0bc25e..2b6eae51596 100644
--- a/addons/website_blog/tests/test_website_blog_flow.py
+++ b/addons/website_blog/tests/test_website_blog_flow.py
@@ -16,7 +16,7 @@ class TestWebsiteBlogFlow(TestWebsiteBlogCommon):
             'name': 'Dorian Portal',
             'login': 'portal_user',
             'email': 'portal_user@example.com',
-            'notification_type': 'inbox',
+            'notification_type': 'email',
             'groups_id': [(6, 0, [group_portal.id])]
         })
 
diff --git a/addons/website_crm_partner_assign/tests/test_partner_assign.py b/addons/website_crm_partner_assign/tests/test_partner_assign.py
index bc0ad24fad7..43250c16641 100644
--- a/addons/website_crm_partner_assign/tests/test_partner_assign.py
+++ b/addons/website_crm_partner_assign/tests/test_partner_assign.py
@@ -102,7 +102,7 @@ class TestPartnerLeadPortal(TestCrmCommon):
             company_id=self.env.ref("base.main_company").id,
             grade_id=self.grade.id,
             user_id=self.user_sales_manager.id,
-            notification_type='inbox',
+            notification_type='email',
             groups='base.group_portal',
         )
 
diff --git a/odoo/addons/base/models/res_users.py b/odoo/addons/base/models/res_users.py
index cbfc6616563..c144a1f1ab3 100644
--- a/odoo/addons/base/models/res_users.py
+++ b/odoo/addons/base/models/res_users.py
@@ -271,6 +271,7 @@ class Users(models.Model):
             'image_1024', 'image_512', 'image_256', 'image_128', 'lang', 'tz',
             'tz_offset', 'groups_id', 'partner_id', '__last_update', 'action_id',
             'avatar_1920', 'avatar_1024', 'avatar_512', 'avatar_256', 'avatar_128',
+            'share',
         ]
 
     @property
@@ -1235,7 +1236,8 @@ class GroupsView(models.Model):
                     user_type_field_name = field_name
                     user_type_readonly = str({'readonly': [(user_type_field_name, '!=', group_employee.id)]})
                     attrs['widget'] = 'radio'
-                    attrs['groups'] = 'base.group_no_one'
+                    # Trigger the on_change of this "virtual field"
+                    attrs['on_change'] = '1'
                     xml1.append(E.field(name=field_name, **attrs))
                     xml1.append(E.newline())
 
@@ -1273,9 +1275,9 @@ class GroupsView(models.Model):
                 xml2.append(E.group(*(xml_by_category[xml_cat]), col="2", string=master_category_name))
 
             xml = E.field(
-                E.group(*(xml1), col="2"),
+                E.group(*(xml1), col="2", groups="base.group_no_one"),
                 E.group(*(xml2), col="2", attrs=str(user_type_attrs)),
-                E.group(*(xml3), col="4", attrs=str(user_type_attrs)), name="groups_id", position="replace")
+                E.group(*(xml3), col="4", attrs=str(user_type_attrs), groups="base.group_no_one"), name="groups_id", position="replace")
             xml.addprevious(etree.Comment("GENERATED AUTOMATICALLY BY GROUPS"))
 
         # serialize and update the view
@@ -1431,6 +1433,22 @@ class UsersView(models.Model):
         return values
 
     def onchange(self, values, field_name, field_onchange):
+        # field_name can be either a string, a list or Falsy
+        if isinstance(field_name, list):
+            names = field_name
+        elif field_name:
+            names = [field_name]
+        else:
+            names = []
+
+        if any(is_reified_group(field) for field in names):
+            field_name = (
+                ['groups_id']
+                + [field for field in names if not is_reified_group(field)]
+            )
+            values.pop('groups_id', None)
+            values.update(self._remove_reified_groups(values))
+
         field_onchange['groups_id'] = ''
         result = super().onchange(values, field_name, field_onchange)
         if not field_name: # merged default_get
diff --git a/odoo/addons/base/tests/test_res_users.py b/odoo/addons/base/tests/test_res_users.py
index fa93dca0407..81161fa6f72 100644
--- a/odoo/addons/base/tests/test_res_users.py
+++ b/odoo/addons/base/tests/test_res_users.py
@@ -171,3 +171,28 @@ class TestUsers2(TransactionCase):
         user.write({fname: group2.id})
         self.assertEqual(user.groups_id & groups, groups)
         self.assertEqual(user.read([fname])[0][fname], group2.id)
+
+    def test_reified_groups_on_change(self):
+        """Test that a change on a reified fields trigger the onchange of groups_id."""
+        group_public = self.env.ref('base.group_public')
+        group_portal = self.env.ref('base.group_portal')
+        group_user = self.env.ref('base.group_user')
+
+        # Build the reified group field name
+        user_groups = group_public | group_portal | group_user
+        user_groups_ids = [str(group_id) for group_id in sorted(user_groups.ids)]
+        group_field_name = f"sel_groups_{'_'.join(user_groups_ids)}"
+
+        user_form = Form(self.env['res.users'], view='base.view_users_form')
+        user_form.name = "Test"
+        user_form.login = "Test"
+        self.assertFalse(user_form.share)
+
+        setattr(user_form, group_field_name, group_portal.id)
+        self.assertTrue(user_form.share, 'The groups_id onchange should have been triggered')
+
+        setattr(user_form, group_field_name, group_user.id)
+        self.assertFalse(user_form.share, 'The groups_id onchange should have been triggered')
+
+        setattr(user_form, group_field_name, group_public.id)
+        self.assertTrue(user_form.share, 'The groups_id onchange should have been triggered')
diff --git a/odoo/addons/base/views/res_users_views.xml b/odoo/addons/base/views/res_users_views.xml
index dee5cba9102..e0769cc1b2e 100644
--- a/odoo/addons/base/views/res_users_views.xml
+++ b/odoo/addons/base/views/res_users_views.xml
@@ -223,6 +223,7 @@
                             <group>
                                 <field name="partner_id" readonly="1" required="0" groups="base.group_no_one"
                                         attrs="{'invisible': [('id', '=', False)]}"/>
+                                <field name="share" invisible="1"/>
                             </group>
                         </div>
                         <notebook colspan="4">
@@ -251,7 +252,8 @@
                                         <field name="tz" widget="timezone_mismatch" options="{'tz_offset_field': 'tz_offset'}" />
                                         <field name="tz_offset" invisible="1"/>
                                     </group>
-                                    <group string="Menus Customization" groups="base.group_no_one">
+                                    <group string="Menus Customization" groups="base.group_no_one"
+                                        attrs="{'invisible': [('share', '=', True)]}">
                                         <field name="action_id"/>
                                     </group>
                                 </group>
@@ -320,7 +322,8 @@
                     <field name="name" filter_domain="['|', '|', ('name','ilike',self), ('login','ilike',self), ('email','ilike',self)]" string="User"/>
                     <field name="company_ids" string="Company" groups="base.group_multi_company"/>
                     <field name="share"/>
-                    <filter name="no_share" string="Internal Users" domain="[('share','=',False)]"/>
+                    <filter name="filter_no_share" string="Internal Users" domain="[('share', '=', False)]"/>
+                    <filter name="filter_share" string="Portal Users" domain="[('share', '=', True)]"/>
                     <separator/>
                     <filter name="Inactive" string="Inactive Users" domain="[('active','=',False)]"/>
                 </search>
@@ -453,6 +456,7 @@
                                     <field name="tz" widget="timezone_mismatch" options="{'tz_offset_field': 'tz_offset'}" readonly="0"/>
                                     <field name="tz_offset" invisible="1"/>
                                 </group>
+                                <field name="share" invisible="1"/>
                             </group>
                             <group name="signature">
                                 <field name="signature" readonly="0" options="{'style-inline': true}"/>