Open Files Panel (F8).
Right-click to show context menu. See screenshots.
Thanks, you nailed it. Why does Adobe make it so difficult to find that feature? In my previous version of DW 2020, it was an invisible spot to the right of the words "Local Files". Hmmmm.... I really got excited when I saw "Size" in the right-click, drop-down menu, hoping that I would be able to increase the size of the type in the Files Panel. Yes, I'm an old guy with declining vision and have to use a magnifying with the Files Panel. Adobe should be ashamed of itsself for not taking its original uses into consideration when it designs its software.
As someone who went from 20/1440 (clinically blind) vision to 20/15, I fully appreciate what you're struggling with. To increase text size in app menus, you have to go to your operating system's display settings.