Here is a simple guide on how to solve the issue that your mouse not move horizontally. this guide container three methods to fix this issue. hope these methods will help you.
How to Fix Mouse Not Moving Horizontally Issue
Restore default settings by removing “PROFSAVE” files in My Documents > Battlefield 2042 > Settings
in your PROFSAVE_profile located in \Documents\Battlefield 2042\settings
Remove the lines that start with:
There’s roughly 20 lines with this string. Delete all of them and save file. Should be fixed now.
Go to Options -> Mouse & Keyboard -> Edit keybindings -> Movement
Find Look Left and Look Right and click on the Mouse Binding to change/clear them
Hold Escape as it says to clear those bindings. They won’t actually clear but they’ll get “rebound” to the same mouse input.