I have a rather weird problem with my desktop of my MacBook Pro. I use El Capitan 10.11.15.
For reasons I don't know I'm no longer able to keep more than one running application visible at the time.
For example, if I start Terminal, it opens. But when I start TextEdit, Terminal will hide or minimize and TexEdit will become visible instead. The same goes for every other application.
When I open Mission Control, it also shows only one active window, no matter how many other applications are running.
I must have accidently activated it but cannot recall how. I've tried playing around with Dock and Mission Control settings, but nothing changed it.
Does anyone know how to get it back to normal so that I have more than one window/application visible at the same time?