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This is what it looks like in current versions of QuarkXPress:
I personally haven't made friends with this yet and am likely to keep this hidden most of the time, as I don't feel like this is an appropriate feature for professional desktop publishing. For a vector design tool it might make more sense for certain use cases, and for certain categories of "off-the-cuff" type designs, but not for professional work in a desktop publishing app, and considering the price point of QuarkXPress that is clearly what the product is intended for.
Professional publishing designs should generally have all of the font selections embedded into text styles and the styles used instead of having one-off inline font choices made from a panel like this. I could see a preview like this being nice if it were selecting full styles from the document's collection of text styles, but for individual fonts I think those choices should normally be made when setting up the styles, then those styles used during the creation of the document. It would therefore make more sense for this to be part of the style editor, rather than an independent panel - but again, that is for a desktop publishing app; for a tool such as VectorStyler, it makes enough sense to offer it separately if people find such a thing useful; I'm not really sure how often I would use it myself.