I may just be missing something and this may seem like a silly question, but is there a way to clear recent flows in the Tableau Prep welcome screen like there is to clear recent workbooks in Tableau Desktop?
No -- you're not missing anything. It's just not there yet. We've heard this request from others -- you should definitely vote it up on the ideas forum.
Idea submitted, please upvote! https://community.tableau.com/ideas/9003
Retrieving data ...