Hi, just to share how I resolve limited resolution selection for M1 MBA
Dock : Dell D3100 (bought USB type B 3.0 to type C)
Monitor Philip 32" 2k display (model forget)
Issue : after install display link manager 1.2, the monitor only limit the max resolution to 2048x1152 which is not usable
Fix : install RDM (
https://avi.alkalay.net/software/RDM/) take ur own risk
RDM allow me to select 2560x1440
Just to share, just incase u r nervous after getting your brand new M1 but monitor resolution disappoint you