Parameters are distributed in several places and some of them are values ‘to be used’ and some are ‘limits not to be exceeded’.
I suppose that at Board Setup-Board Stackup-Solder Mask/Paste you will find 0.08 somewhere.
You are clearly trying to do it too fast. It is clear that you didn’t read the indicated by an arrow sentence.
Edit.
Global settings can be overwritten by footprint settings and they can be overwritten by each pad settings. Zone fills have also their own settings. Net classes have their own settings. Custom rules can also play.