I'm looking for a way to view all desktops (Spaces) at once with a single shortcut (like Command ↑ for Mission Control). If I could archive the same effect you get when you use Mission Control and go up with your mouse as explained in: Apple Support Document Work in Multiple Spaces
I noticed that when you have at least one fullscreen app open (and it is focused), Mission Control will always show the Spaces preview but in all other circumstances it will only list other spaces in at the top as Desktop 1, Desktop 2, Desktop 3 etc.
This is the effect I want to achieve (when activating Mission Control; show a preview of the Spaces)
Any 3rd party options would also be acceptable.