"Export as MP3" spec window has become full-screen

Longtime frequent Audacity user. Using Audacity 2.3.2 on Windows 7.
A new non-feature, starting around a month ago. Perhaps it requires some kind of secret action to undo.
When I initiate an “Export as MP3”, instead of a typical ~5 x 4 file, folder, bps, etc-setting subwindow, that same function comes up occupying the full screen. It still works, but the full screen is a huge nuisance. I’ve attached a screenshot of it. How can I make that go back to the way it was?