I'm pretty sure you increase the font size in TCMD'd file explorer by increasing the font size in Windows Explorer. I did it via Settings\EaseOfAccess\Display\MakeTextBigger. The change is not immediate in TCMD; TCMD needs to be restarted.
That's really weird! It changes the view (sometimes), icon sizes (sometimes), the spacing between things (sometimes), and (only when you get to the very bottom of the wheel-scrolling when you get to "content view") the font. And that view seems rather lacking in content!