Are you talking about the mini map on the Home page?
On my T865 tablet, the scale of that mini map on the Home page is the same as it is on the Map page. The streets, street names, waypoints, everything is the same size/scale. So whatever you have the scale and sizes of those things you have set up for the main map page are the same on the mini map.
I haven’t found any setting for adjusting scale of things for the Mini Map independently.
You adjust all those aspects by tapping the map layers icon (to the left of the search icon) at the top of the screen on the Map page. Go to Scale & Visibility menu. There you find the setting for scaling the Map, Labels and Symbols.
In the Routing UI menu you find scale adjustments for Line Width, Line Opacity, Arrows Size and Indications size.
Go thru that whole menu on the left side of the Map Configuration page and set those menus up to your preferences.
