This add-on replaces Ctrl+G by its own functionality - creating groups using regular instances
In the add-on "Group" - it is an instance, that can be edited (in the scene called "Library") by pressing Tab
Ctrl+G - Make Group (Instance) from selected objects (F9 (adjust last operation) to set center of the group and set a name)
Tab - Opens group edit mode
Deselect everything and press Tab - Return to scene.
Ctrl+Alt+G - Ungroup
Ctrl+Shift+G - Advanced options like make single user, and change instance (Replace chair by another chair).
This add-on uses regular Blender instances, so you can send your blend file with "groups" made by this add-on, even if your co-worker haven't this add-on installed.
Take a look at my other goods: Synchronize Workspaces | Folds Modifier
Add walkaround for issue https://projects.blender.org/blender/blender/issues/125335
This extension does not require special permissions.
Excellent Add-on. Makes handling scenes with many identical parts so much easier. And it can also handle collection instances - even if there is no original or real collection for the instances in the view layers. Just use the shortcut CTRL-SHIFT-G on an collection instance and select "Fix this". You can then edit the objects within the collection instance again.