All of what you read below applies to every Battlefield game on PC from BF4 until the present day, including my own personal settings, summarized at the bottom of this sheet.
This guide existed for BF2042 in it's launch state and up until April 2022, with Update #4.0. Prior to that update, you had to finely adjust sensitivity in PROFSAVE_profile. After the update, the ability to edit sensitvity by decimal points was brought back from the dead (and BFV). Along with this was a general fix for the underpinnings of how mouselook works in 2042, reverted to the system used since BF4. This allows this guide to be relevant to multiple BF titles.
If you wish to more finely tune your sensitivity, keep reading.