The "Mission Control" button (F3) does not work as expected on MacOS.

Normally, (on just about every other Mac keyboard) CMD + MC shows the desktop, and the CTRL + MC shows the App Expose, but it does not work on the MX Keys. To make matters worse, since there is no way to set different functionality for the media keys with modifiers, the user has no way to set it that way manually either.

This is such a basic functionality expected out of the box, quite a disappointment (especially given the price and the touted customizability of the keyboard). Separately, it's also a big feature miss that you cannot set different functionality for the media keys with modifiers.