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Comfy.n - as I said elsewhere, what I know about OPF files would fit onto the back of a penny black. Never the less I had a play around. I don't understand why "Find non-EPUB 3.0 books" finds books which have neither an EPUB nor a KEPUB.
I've attached an EPUB 2.0 file, what am I expected to make of this:
The epub gets a green tick from the calibre book editor and Sigil - I don't have epubcheck (Java the language it's okay-ish, but on Windows Java run time is not okay - IMO)
I see OPF Helper is, like CCR, non-modal. I don't have a problem with that per se.
But, and I've been meaning to ask this in respect to CCR, if the library manager is run full-screen and the CCR and OPF Helper windows are "popped", then one would see something like this:
If I click on calibre main window it will be bought to the front and the CCR and OPF Helper windows will be out of sight. How is the user meant to deal with that - on Windows*, and on MacOS, and on umpteen flavours of Linux.
You might want to have a look at how the calibre book editor handles the Spellchecker and Reports windows, which are also non modal… but they can't get trapped behind the main window. If they're in the way, I press Ctrl+Win+T (stay on top), Ctrl+Win+R (roll up) and park them somewhere.
BR
* on Windows it can be dealt with via the Taskbar, but how exactly depends on Taskbar settings and its current state.