Your Pebble mouse 2 definetely need a new design or maybe engineering with the easy switch buttom. Is not easy switch at all if its below the mouse. Why not put it at the top or in the weel bottom. I'm CHanging to Dell mouse now because of this problem. Read a little bit of reddit topic about this so you can see is a common problem for lot of people. We have been waiting more than 3 years to get a fix.

https://www.reddit.com/r/logitech/comments/rxrc85/mx_master_3_why_did_they_put_the_easy_switch/