Why the mouse would share a toggle (circled in red upper right) with the keyboard modifier keys section is beyond me, and since I didn’t know the name of my keyboard, when I saw MX 3 (the name of my mouse) in the keyboard(s) toggle, instead of the keyboard, I just figured MX 3 was the name of my keyboard. And so I thought I was changing the modifier keys to the correct settings on my keyboard, but instead I was actually changing the settings on my mouse—which wasn’t doing anything because you can’t change a keyboard modifier on a mouse because it’s a mouse and has no keys. And so best I can tell, my mouse isn’t even supposed one of the choices in that toggle, and it appears that Apple OSX mistook my mouse as a keyboard and included it as one of the toggle options in the keyboard modifier menu.
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