Hi, so my screen's native resolution is 1920x1080 and the game window in both docked mode and non-docked (because the game automatically retains that resolution irrespective of being docked) is 958x1008.
Based on what you're suggesting, it seems that the minute the game window width goes below 1000 the cursor becomes misaligned. The closest to a docked window size I can get using just in-game settings is 1280x1024 but this takes up the vast majority of the screen - I may as well just play in fullscreen/native in this regard. The in-game setting below that 958x1008 is a window of 1024x768 which is equivalent to a window being docked in a corner. That corner-docked size is fine I've I'm working on multiple things and just having the game running and easy to swap to but I rarely work like this; if I'm needing to use corner-docking then I need all 4 corners so the game won't be running.