I'm sure Quick Reference Panels didn't disappear until recently

When I open a quick reference panel to a scene in my novel, then switch to another application (e.g., notes, spreadsheet or a webpage), the quick reference panel is hidden and only the main Scrivener window remains.

I used to be able to have a quick reference panel open on one side of my screen and some other app on the other half, making it easy to copy/paste between applications. It is very annoying that the behavior has changed. I hope this is a bug and fixable.

Perhaps … Window > Float Quick Reference Panels (CONTROL OPTION COMMAND Q)?