Source: Steam Community (opens in a new tab)

Window Dragging & Mouse Lock Improvements
Update Details:
- Fixed an issue where the game window could not be dragged in windowed mode.
- The mouse is now locked only during gameplay. In other menus (main menu, pause menu, options, etc.), you can freely move, resize, and drag the window.
- Multi-monitor setup: We've attempted to fix the issue where the game launches on the secondary monitor. We would greatly appreciate it if affected players could check and let us know if the issue persists.