You'll want to close the expanded record and look for the "hidden fields" button next to the filter button:Click that, then you should be able to unhide and move around those 8 hidden fields. After you unhide and/or reorder them, that will be reflect...
This should do the trick, I think: REGEX_EXTRACT({PDF Text Extraction}, "Patient's name: (.*?) Birthdate:") As for testing, I find that Google Sheets gives far better error messages and uses the same syntax (as far as I've seen), so that's what I use...