F11 key changed functionality F11 on my Mac used to show Desktop. Something changed in my function keys and I cannot figure out what. The F11 key now decreases volume on my speaker, and the only way to see my Desktop is to now use the keyboard shortcut Fn + F11. This is very annoying.

My keyboard shortcut under System Preferences shows that F11 (by itself) is supposed to show Desktop.

The F12 key used to be set to a particular function in Adobe InDesign but is no longer working either. I didn't knowingly change my keyboard.

Any help would be greatly appreciated.
Go to System Preferences app → Keyboard → Keyboard and check Use F1, F2, etc. keys as standard function keys.