Not quite like window shopping in a department store per se, but essentially the same if I can’t find what I was looking for and search for alternatives on the way out. I’ve gotten weird looks sometimes when this happens, including cases where I’m asked for a receipt. “You didn’t have what I was looking for” or “What receipt? I didn’t buy anything” seem to satisfy staff inasmuch as I’m not a tiny person and aren’t inclined to take shit from rent-a-cop security or management - just try to detain me, I’m not waiting for the cops, I’m dealing with it first hand right away.