The problem I’ve found is that you cannot create an action that triggers on exiting an app.
So Ive had to compromise
Lets look at the ‘Stop Flying’ shortcut, you’ll notice the strange command, SPRINGBOARD in the last shot. Unfortunately when you run this shortcut the shortcut menu stays open so you’re on that screen, a quick geek around found the Springboard script which when run jumps you back to your main screen.
Little screen recording of it all in action
@PingSpike, all you need to do is add stop flying to your shortcuts and you’re good to go (or stop as the case is)