In Ubuntu 16.04 each workspace had a separate 'application space' as it were. That is, when you were on workspace 1 you could only loop through applications on that workspace. So I could have, for example, one Firefox instance on workspace 1 and another on workspace 2. If I was on workspace 1, I could only loop through Firefox instances on that workspace. But now, in Ubuntu 18.04, there is no such separation: looping through applications on one workspace could suddenly whisk me away to another workspace. Is there any way to recover this separation of workspaces from Ubuntu 16.04 in 18.04?