Problem
Several usability testers were confused by the terms "Visual" and "Source" - which indicates to me that the terminology is inside baseball, in that the terms might be familiar to us as product names, but not recognizable or actionable for the average user.
Screenshot
Possible Solutions
- changing the terms
- aligning the ui with visual editor - something like this mockup from @schoenbaechler
- moving this into a toggle to minimize source mode