Sorry to hear, you're facing issues with the interface. We're running tests on several configurations, but up to now, we can't reproduce the described behavior. Are you using a tablet / 3Dconnexion mouse or any similar device? Any additional info is welcome.
Does your system use any scaling? If so, I would suggest you set following options for the 3dsmax.exe Properties: Program DPI > Use this setting to fix scaling problems for this program instead of the on in Settings & High DPI scaling override > Override high DPI scaling behavior. Scaling performed by: System (Enhanced).
Thanks in advance for any further comments on this issue you can share about it with us / our user community.