My tag list is quite long, and requires some time to scroll to the entries higher in the alphabet.
It would be nice to have a two-dimensional popup that could fit more in the screen at a time.
Roughly, https://imgur.com/a/MzgiJSc
becomes https://imgur.com/a/Za3uLxN
There is no such popup control in macOS. Note that you can click to bring up the popup list, then type one or more letters to take you directly to the tag you want (or you can just type in the tag yourself if that's faster (you don't have to select it from the list).