The OP got the answer in their double-post
https://www.mobileread.com/forums/sh...d.php?t=366641
BTW: this question is answered in
the calibre documentation for the tag browser.
Quote:
Items in the Tag browser have their icons partially colored. The amount of color depends on the average rating of the books in that category. So for example if the books by Isaac Asimov have an average of four stars, the icon for Isaac Asimov in the Tag browser will be 4/5th colored. You can hover your mouse over the icon to see the average rating.
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