I can't get any of those commands to do anything.
I have to press the, "fn" key to expose the commands on the changing bar at the top of my keyboard.
If I press the "fn" key, then press any of the "F1-F11" keys, nothing happens.
I used to shortcut by pressing, "fn" and at the same time, "F10" (or "F11") and the multiple windows on my desktop would disappear. Now that shortcut is not working with the new OS.
When I press the "command" key, the "fn" keys at the top of my keyboard are not exposed on my MacBook Pro.
Any other suggestions?