Bookmarking catalog cover

[BrooksNYC]

Hi, all.

This is such a trifling question that I doubt anyone but me would bother asking it!

I bookmark the covers of my books. (I can view book covers by scrolling, of course, but have gotten used to clicking a bookmark.)

I also like to "Create a catalog of the books in [my] Calibre Library".

Until recently, it was possible to bookmark the covers of books, and also the covers of library catalogs. Am still able to bookmark book covers (ePubs), but can no longer bookmark the covers of catalogs.

Here's the recurring error message:



(EDIT: Sorry....not sure why the image link isn't working.)

Again: A trifling concern, but thought I'd ask.

Kind thanks for your help!

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Windows 10 Pro (x64)
Calibre 9.18.0