I’ve been struggling with Fitts’ Law since I added an external monitor above my MacBook Pro.
Physically, the screens are arranged like this, with the MBP on a keyboard self of a table-top standing desk. The external monitor is on a height adjustable vesa mount, part of the desk.
The downside of this arrangement is that I’m unable to easily access the menubar for the bottom screen, as the mouse cursor just flies straight through it onto the top display.
I’ve tried a logical side-by-side arrangement in the displays preferences, but it breaks my head getting from top to bottom by going left to right.
My current work-around is to offset the displays logically like this, so that I get a “sticky” corner that my cursor can get trapped in. Then I just need to scroll right to the menu I need.