Universal Control iPad placement when using multiple displays
I can't reply to the old questions where this was a problem, but I found a solution.
Problem: Cannot move iPad in Arrange Displays when the iPad is connected via Universal Control.
Solution: The iPad gets attached to whatever is your "Main Display". Change your main large display to "Main Display" and then you MacBook display becomes an "Extended Display". Then you can move the iPad to wherever you need it in relation to your main display.
Really helpful when you want to use your desktop mouse and keyboard on your iPad, especially in a setup where you need to keep your work stuff separate from personal stuff.