Known issueHow-toUpdated · 2 replies on Steam
NSFW Solitaire & Puzzles: How to Use New Deck Art? (*Resolved!*)
Short answer
Suggested fix (unconfirmed): Go to Options, select Graphics, and choose your new card set under Card sets.
The problem
So... Obviously I'm an idiot. But... Just got a DLC pack. Want to use that for my solitaire deck but there does not seem to be a button to make that happen. There's a list of decks and demos. I can hide individual cards and even start a slide show but Having it as my deck? ...which I thought was the point... I can't make anything do that. The controls have changed since last I played I think…
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Source: original Steam Community discussion. Quotes are shortened; all credit goes to the posters.