Switch devices at once for both MX Keys and MX Master 3
Make it so that when the switch device key on either MX Keys or MX Master 3 is pressed, both Keys and Master 3 will switch devices together. If not it's very troublesome to have to switch by clicking two buttons (especially the Master 3 - have to click twice if just switching between 2 devices).

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Jeremy Fairbrass commented
I would love this too - but not only for the MX Keys, but for any Logi keyboard that has Easy-Switch buttons - such as the Ergo K860 - and any mouse that also has Easy-Switch buttons.
It should be possible to bind the keyboard Easy-Switch buttons with the mouse Easy-Switch buttons, so that both work in sync with each other.
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Gustavo Nogueira commented
I would really appreciate this feature, as I use the same mouse and keyboard for both work computer and personal computer and, at the start and end of each day, I have to do the same task of raising my MX Master 3, clicking the button two times, put it back, and switch the MX Keys, too.