Examples: Qt dropdown text and search input field not visible (was: There's no apparent way to search examples)

I'm pretty sure there used to be a way to search the provided examples, but there doesn't appear to be one now. Command-F isn't effective, and the search box at the lower left doesn't work in the examples area. This is under Mac OS 11.2.1, full Qt installation of 5.15.2 with the online installer.

Screen shot attached.