When you close a prototype in the desktop app, the app should switch focus back to the file that the prototype was launched from. Currently closing a prototype works like closing any other tab, and automatically opens the file directly to the right of the tab that’s closed if any are open.
Anyway, I’m reposting someone else’s original post because this is still really bothersome to me. Original post here: Closing a prototype should shift focus to the file that launched the prototype