What version of AutoCAD are you using as shown in ABOUT command? Not sure I've ever seen that as I look in top files with many XREFs in them, unless you just simply mean your XREFs have text style names you'd never use.
It is a bug in AC for Mac - they (xref text and dimension styles) should not be visible in dropdown list in the Properties palette. But they are visible because of that bug and you cannot hide them.
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