Tap your profile photo in the top left, tap the settings cog on the right, and tap share feedback.
Several non-google apps were more obscure. GitHub feedback is an email address.
I've been waiting for 5+ years for a decent GH mobile experience. Suffice it to say, major disappointment for this "beta"
What are they even doing with repo sorting, uuid based? Certainly not time or alphabetical like the web experience