Folks who work from coffee shops all day, what kind of job are you doing?

WFH has been normal for me since long before it was a big thing. It's only since moving to Austin have I thought about getting out of my home office occasionally and joining the crowds working at coffee shops. Sadly, I tried it a few weeks ago and felt like a kid on his first day at school! I didn't know what to do when I needed to use the bathroom - leave everything at the table? How often do I buy another coffee? And moreover, what are all these jobs where people never need to talk to anyone on the phone (or teams/zoom)?

People who spend entire mornings or even days in coffee shops doing productive work, what's the secret?