I’m not sure this happened since Anki was in this state when I came back to my computer, but on the main window, nothing was responsive and the layout didn’t update when I resized it. When I made the window very wide, however, I could see the “Study Now” button peeking out from behind the deck list, so it seems like the deck list wasn’t hidden when it was supposed to be. Clicking “Study Now” opened the study view, but the deck list was still shown.
if you could try to replicate in 2.1.60, it would be helpful or maybe it could solve the issue
This release fixes an issue in 2.1.57 that caused cards and deck presets
to be reset to the default ease, if you exported a .colpkg with compatibility
with older clients enabled, or used the downgrade and quit option, then opened
the collection again. For the former issue, this occurred to the collection you
were exporting from, and not just the .colpkg file. If you were affected by this,
running the following in the debug console after updating should restore your
cards to the ease they were at when you last reviewed them, if they were not
reviewed after the problem occurred. Please make a backup before proceeding.