@leocg where can i find these possible solutions?

I have been using opera GX for about a year now until this morning when i clicked "restore down" and it vanisched. The app icon itself is still appearing on my home screen but when i try to open it i can't see anything. when I hover over the icon with my mouse it says it opened the app but when i click on it, it doesn't appear on my screen. If anybody has some tips on how to fix this please let me know!