PP "Ghost App":
- Launch Expo
- While expo is showing your desktops, click on any app in your launcher.
The app will not show in any viewport. Yet, it is running. You can pidof it, you can see it with alt+tab, etc. But you can't find it or switch to it. (in fact, it is on the last viewport you had active as a ghost app: it steal focus, etc): you just won't see it.
To show it: Click on app in launcher again. Its options open in panel. Click any menu on panel.
Regards, Effenberg