MacBookPro Desktop Screen Display Action
I think that you need to change a setting of your Dock!
Or do you maybe have an app to organise your desktops or not?

I just remember this: click on the green circle top left corner (button to go full screen) but you hold the command key down while clicking and dragging the window to the left or right and normaly, it will set the window of your app to go from the left/right of your screen to the middle of your screen.
Do the same for another app but got the other direction. :-)
I don't know if this is understandable? :-(