I think this is what you're looking for. To change how things appear on
screen, go to Control Panel > Display >Appearance tab >Advanced button (in
l-r). In second box this gets, is what you want there ? if so click on it;
this gets all the available changes for that particular item (font size and
color, background color, etc). If it's greyed out, it can't be changed.
When done, click OK, Apply, OK.
NOTE: Before you make any changes , write down the currently-displayed
settings so it won't become irreversible.
HTH,
Malv