From the
calibre user manual (third paragraph in the section):
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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You can turn this off by unchecking Preferences / Look & feel / Tag browser / Show average ratings