Apex Legends using a mouse in SteamOS - in menus it is fine but in-game it points down or up constantly. I have tried USB and bluetooth mouse and it's the same
Apex Legends Mouse Lag? 5 Quick Ways to Fix the Problem
Apex Legends Mouse Lag? 5 Quick Ways to Fix the Problem
Apex Legend: Mouse Cursor in Game FIX - YouTube
How to Fix the Apex Legends Mouse Issue (Quick & Easy Tutorial) - YouTube