Prompts to change monitors displays comes every 5 seconds

[stevef]

You're welcome.  I hope it has fixed it for you.

Now that I've deleted them, the problem seems to have disappeared.

Which shortcuts did you remove ?

From what I read, removing the Display shortcut is the hack that seems to alleviate the problem (in some cases).

Command                                  Shortcut
xfce4-display-settings --minimal  Display

So you may be able to retain the 'Super P' shortcut for display settings if you use it.

Will this affect any of the other apps and programs?

Shouldn't do, but then again, having the short cut shouldn't trigger pop ups.