Revisit wokwi and refresh the projects I noticed wokwi losing functions over the past fortnight. Now (yesterday), after refreshing all my projects, wokwi looks normally good again.
I had an accessibility feature turned on that says "don't use font smaller than 12 points" to make it easy on my eyes but that seems to create an issue. Disabling it fixes it - unfortunately no quick fix (see the GitHub issue for details)