Hello Ajiinn972,
welcome to our community.
I’m sorry, but I have not found solutions to this problem. My OS is Windows 10, graphic card is a GeForce GTX 1650 and FS version is 1.12.13.0 in FullScreen mode. I’ve tried all kinds of combinations of resolution and refresh rate, but every time I move a window to the secondary monitor, FS freezes. Instead everything works fine if FS is in Windowed mode.