I, and others, have noted some issues with the UI on MacOS.
See here: Bug on Mac, right click for context menu on external display doesn't work
and here: (BUG) BlockEdit window disappears when dragged to another monitor
Those both relate to using external displays, but with the latest update (Version 8 (8.20.25140.13002, 2025-05-20)) there’s an issue with the Snapshot window even on the main display - it renders with a transparent background:
