Do you mean that you cannot change the number of decimal digits in Project Preferences > Calculation Units & Rules normally? Or that the value changed mysteriously on its own?
This is (unfortunately) not a setting that can be changed from view to view... but is a global, project preference. This dates back to Archicad's earliest days, and there has been a wishlist item for years to allow this preference to be made view-specific.
One of the forum moderators AC 27 USA and earlier • macOS Ventura 13.6.2, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB