See Preferences / Look & feel / Tag browser. Change the value in "Spacing between items". I use 0.5.
If you also want to change the spacing in the book list, go to Preferences / Look & feel / Main interface and change the number in "Extra soacing to add between rows in the book list". I use -9.
Note that the two numbers mean different things. In the tag browser you are setting the actual height. In the book list you are setting an increment.
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