Someone else posted a similar query was posted several months ago but was not answered.
I have a dual-monitor setup. Left monitor is a 144Hz AOC and is the primary monitor. Right monitor is an older 60Hz Dell.
Game will only launch on the right monitor. If it’s set to windowed mode and moved to the left monitor, the game will relaunch on the right.
Information on the system is here: https://paste.ubuntu.com/p/8NPjXTjBkq/
I’m hoping there are options in Lutris to select which monitor games are launched on.