Created attachment 104902 [details] Vivaldi opened the 1. activity, but showing all I use activity pager, and (is it relevant?) enable "Remember the current virtual desktop for each activity". I have 4 activities and 4 VDs. The 1. activity show 1. VD, the 2. activity show 2. VD, 3. -> 3. VD and 4. -> 4. VD. Works fine, but some application displaying all activities. For example: chromium, vivaldi, octopi-notifier, spectacle, some KDE popup windows like KDE su. All other application works fine, and just showing in activity where opened.
Created attachment 104903 [details] Konsole shown only where opened
Created attachment 104904 [details] Activitypager showing all activities, pager works fine.
In panel icon of applications possible to set: which activity show the application, just disable all activities... and works fine.