I have an MX3 mouse and MX Keys. I use them with a MacBookPro (Flow #1 on the left) and a Dell laptop (PC) (Flow #2 on the right) . I'm using the LogiOptions +.

I don't know why but, today in particular, it keeps shifting the keyboard and mouse over to the MacBookPro. Very frustrating!

It would be really nice to have a mouse button/action that forces the flow to #1 or #2. Instead, I find myself flipping the mouse upside down, selecting the one I want and then (in frustration) slamming the corresponding button on the keyboard.

I ended up just shutting down the MacBookPro. (not really the solution I was looking for).