It's just the Dewey Decimal System, so you could look up whatever topic you like to find what it would be classified under. There's thousands of topics that are covered here - there's a reason it's used for every non-fiction clarification in a library - that would be far too numerous to list on a single shelf listing. This library has chosen to prioritize the awkward questions as a way to help someone who otherwise may not know how to get help.
Alternatively, most libraries have a catalogue you can search by keyword and it will give you book results which will let you know where they are on the shelves. But again, that requires you to know that the catalogue exists and how to use it. It's always going to be easier to ask a librarian, who can make sure you find something to help.
Not to discredit this but I feel like maybe there should be a directory about all topics with shelf numbers and not just about hard to talk about topics?
As a library, you should give me a directory where I can find anything I want. And these topics could be included in that one directory and not singled out in the middle where anyone looking at it can be targeted by some fucking bigot.
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