Hi Everyone,
I found the same problem with a three monitor display. When you go to the 'Rearrange your displays' setting (Setting-System-Display) you see an representation of the displays lined up beside each other. You can actually drag these images vertically. My center display is quite large relative to the other two. If I line up the bottom edges of all of the displays, I can easily move the mouse from one display to the other as long as I am not trying to move to or from the higher part of the large display. It takes the relative sizes as actual. What a difference!