diff --git a/addons/web/static/src/views/fields/many2many_tags/many2many_tags_field.scss b/addons/web/static/src/views/fields/many2many_tags/many2many_tags_field.scss
index 4be3b641cf8..dc9857c039e 100644
--- a/addons/web/static/src/views/fields/many2many_tags/many2many_tags_field.scss
+++ b/addons/web/static/src/views/fields/many2many_tags/many2many_tags_field.scss
@@ -75,8 +75,12 @@
     }
 }
 
-.o_form_view .o_group .o_field_tags {
-    width: 100%;
+.o_form_view {
+    .o_group, .o_inner_group {
+        .o_field_tags {
+            width: 100%;
+        }
+    }
 }
 
 .o_form_statusbar .o_field_tags {
diff --git a/addons/web/static/src/views/form/form_controller.scss b/addons/web/static/src/views/form/form_controller.scss
index 018cad54c8c..71a728c2ffa 100644
--- a/addons/web/static/src/views/form/form_controller.scss
+++ b/addons/web/static/src/views/form/form_controller.scss
@@ -449,6 +449,12 @@
         }
     }
 
+    .o_group, .o_inner_group {
+        .o_field_widget {
+            width: 100%;
+        }
+    }
+
     .o_checkbox_optional_field {
         display: flex;