I can only speak for the Cinnamon desktop environment on Linux Mint, but it’s very simple:

- Apps always launch on the monitor your mouse cursor is on

- Switching the focused window to the other monitor is Win+Shift+Arrow Keys

So if I clicked to open an app, it’s on the monitor I’m already looking at. If I used a keyboard shortcut, win+shift+arrow is super easy and simple.

The fact that it’s a stupid simple rule means I can get way better at just doing things by muscle memory… I don’t have to worry about being outsmarted by the window manager.

>Apps always launch on the monitor your mouse cursor is on

...but you can set up rules to force a given program to always launch at a specified position and dimension.

Thanks Im going to try it