My app has an external display when a second screen is connected. It displays the main content I want that people see while I navigate through others views. it works fine.
Is there a way to keep this external display active when app is entering background ?
I enabled background mode in Capabilities tab, I'm able to run code in background, it refreshes correctly when I enter foreground again.
AFAIK the answer is No.
As soon as your app goes to the background, it loses control of the external screen.