There is a toggle switch in GNOME Tweaks but that toggle isn't exposed in Ubuntu because
1) It duplicates the functionality already in the GNOME Settings app on Ubuntu
2) The Ubuntu feature still uses a different gsettings key, in part because there are still patches for this feature that GNOME hasn't reviewed yet (for gnome-shell in particular).
There is a toggle switch in GNOME Tweaks but that toggle isn't exposed in Ubuntu because
1) It duplicates the functionality already in the GNOME Settings app on Ubuntu
2) The Ubuntu feature still uses a different gsettings key, in part because there are still patches for this feature that GNOME hasn't reviewed yet (for gnome-shell in particular).