diff --git a/addons/hr_timesheet/__init__.py b/addons/hr_timesheet/__init__.py
index 6aab6c417a5..0fa9235b104 100644
--- a/addons/hr_timesheet/__init__.py
+++ b/addons/hr_timesheet/__init__.py
@@ -11,6 +11,11 @@ from odoo import api, fields, SUPERUSER_ID, _
 
 def create_internal_project(cr, registry):
     env = api.Environment(cr, SUPERUSER_ID, {})
+
+    # allow_timesheets is set by default, but erased for existing projects at
+    # installation, as there is no analytic account for them.
+    env['project.project'].search([]).write({'allow_timesheets': True})
+
     admin = env.ref('base.user_admin', raise_if_not_found=False)
     if not admin:
         return
diff --git a/addons/project/models/res_config_settings.py b/addons/project/models/res_config_settings.py
index 1831c1cd0ca..ae12e7efb23 100644
--- a/addons/project/models/res_config_settings.py
+++ b/addons/project/models/res_config_settings.py
@@ -14,6 +14,20 @@ class ResConfigSettings(models.TransientModel):
     group_project_recurring_tasks = fields.Boolean("Recurring Tasks", implied_group="project.group_project_recurring_tasks")
 
     def set_values(self):
-        if self.user_has_groups('project.group_project_recurring_tasks') != self.group_project_recurring_tasks:
-            self.env['project.project'].sudo().search([]).write({'allow_recurring_tasks': self.group_project_recurring_tasks})
+
+        # Ensure that settings on existing projects match the above fields
+        projects = self.env["project.project"].search([])
+        features = (
+            # Pairs of associated (config_flag, project_flag)
+            ("group_subtask_project", "allow_subtasks"),
+            ("group_project_rating", "rating_active"),
+            ("group_project_recurring_tasks", "allow_recurring_tasks"),
+            )
+        for (config_flag, project_flag) in features:
+            config_flag_global = "project." + config_flag
+            config_feature_enabled = self[config_flag]
+            if (self.user_has_groups(config_flag_global)
+                    is not config_feature_enabled):
+                projects[project_flag] = config_feature_enabled
+
         super(ResConfigSettings, self).set_values()
diff --git a/addons/project/tests/__init__.py b/addons/project/tests/__init__.py
index aadb3c31f42..d5c89ac7b9d 100644
--- a/addons/project/tests/__init__.py
+++ b/addons/project/tests/__init__.py
@@ -1,4 +1,9 @@
 # -*- coding: utf-8 -*-
 
-from . import test_project_base, test_project_flow, test_access_rights, test_project_recurrence, test_project_ui
+from . import test_access_rights
+from . import test_project_base
+from . import test_project_config
+from . import test_project_flow
+from . import test_project_recurrence
+from . import test_project_ui
 from . import test_multicompany
diff --git a/addons/project/tests/test_project_config.py b/addons/project/tests/test_project_config.py
new file mode 100644
index 00000000000..e84c648aa22
--- /dev/null
+++ b/addons/project/tests/test_project_config.py
@@ -0,0 +1,61 @@
+# -*- coding: utf-8 -*-
+
+import logging
+
+from .test_project_base import TestProjectCommon
+
+_logger = logging.getLogger(__name__)
+
+
+class TestProjectConfig(TestProjectCommon):
+    """Test module configuration and its effects on projects."""
+
+    @classmethod
+    def setUpClass(cls):
+        super(TestProjectConfig, cls).setUpClass()
+        cls.Project = cls.env["project.project"]
+        cls.Settings = cls.env["res.config.settings"]
+        cls.features = (
+            # Pairs of associated (config_flag, project_flag)
+            ("group_subtask_project", "allow_subtasks"),
+            ("group_project_recurring_tasks", "allow_recurring_tasks"),
+            ("group_project_rating", "rating_active"),
+            )
+
+        # Start with a known value on feature flags to ensure validity of tests
+        cls._set_feature_status(is_enabled=False)
+
+    @classmethod
+    def _set_feature_status(cls, is_enabled):
+        """Set enabled/disabled status of all optional features in the
+        project app config to is_enabled (boolean).
+        """
+        features_config = cls.Settings.create(
+            {feature[0]: is_enabled for feature in cls.features})
+        features_config.execute()
+
+    def test_existing_projects_enable_features(self):
+        """Check that *existing* projects have features enabled when
+        the user enables them in the module configuration.
+        """
+        self._set_feature_status(is_enabled=True)
+        for config_flag, project_flag in self.features:
+            self.assertTrue(
+                self.project_pigs[project_flag],
+                "Existing project failed to adopt activation of "
+                f"{config_flag}/{project_flag} feature")
+
+    def test_new_projects_enable_features(self):
+        """Check that after the user enables features in the module
+        configuration, *newly created* projects have those features
+        enabled as well.
+        """
+        self._set_feature_status(is_enabled=True)
+        project_cows = self.Project.create({
+            "name": "Cows",
+            "partner_id": self.partner_1.id})
+        for config_flag, project_flag in self.features:
+            self.assertTrue(
+                project_cows[project_flag],
+                f"Newly created project failed to adopt activation of "
+                f"{config_flag}/{project_flag} feature")