William Morder via tde-users composed on 2022-11-21 23:01 (UTC-0800):
/home/~/.trinity/share/config/kcalcrc
...
[Font] Font=FreeSans [GNU ],42,-1,5,75,0,0,0,0,0
... This desire belongs in an enhancement bug report. The existing setting affects only the small output display section of the app. All the rest is using a TDE global UI font setting. It's a bit silly that a mere nominal portion of the app's screen space is affected by a so-called "font size" setting. Whether the devs would agree with you is another matter. Presumably if the button text needs to be bigger, so does the main menu text, which is the exact same size. The thing is, when "Show All" is selected, the app roughly doubles in size. If you doubled the nominal button text size (which quadruples the area occupied by a glyph) while keeping the perspectives the same, the minimum size of the app could wind up being more than half of total screen space. Asking for adjustable text size would probably complicate the apps design more than our current fleet of devs would want to spend time on. I'd rather ask for a simple big button mode option, such as is common among stand alone calculators. The meaning of big button would need to be determined, but I'd expect at most a 16pt font where the configured UI size is 10pt.