In the default initial configuration to run in full-screen mode, the game starts with a desktop window that is smaller than the native resolution of my primary monitor, and ends up with a full-screen window that is the native resolution of my primary monitor. However, inbetween these two states it briefly does something that messes with my multi-monitor setup, with unrelated windows forcibly moved from my secondary monitor to my primary one. (I suspect it switches to full screen at the initial lower resolution?)

There is a work-around by playing in borderless window mode, but of course that fails to trap the mouse to the game window (and I believe can also lead to performance issues?).

OS: Windows 10; GPU: nvidia GTX 1070Ti