I was fooling around in the keyboard shortcut section, and accidentally changed the HUD's shortcut from Alt L to Mod 2 + Alt L.
Now, whenever I hold and even press the alt key, HUD will pop up. I don't have the option to hold the alt key, and then press F4 to close a window.
How can I get this back to normal? Every time I try too, I can never get the shortcut back to just Alt L.