I’ve used X and Pro for years. My #1 complaint is that the headings are too large relative to the body text, and that the default body text size in the templates is too small. So I usually increase the size of the fonts using the Content Font Size control in the Typography panel. ( I like about 1.3 EM or REM for body fonts.)
But this zooms up the heading font H1 etc way too large. This looks especially bad on mobile devices. Frankly, I’d like the size of Heading 1 to be the size of Heading 3 and go down from there.
Is there a way to adjust the heading sizes universally in the theme to make them smaller? I’ve never found a control for that.