My home's master bathroom has an oversized step-in shower -- two showerheads, frankly over the top. Bathroom exhaust fan does a fine job preventing moisture build-up in the bathroom during even long showers with both showerheads. BUT, moisture lingers in the shower area. Exhaust fan is well outside the shower. I feel the exhaust fan is drawing in external air from the rest of the living space, and exhausting that air out the exhaust fan, without pulling much air from/through the shower.
As an experiment, I put a box fan at the entrance to the shower. After showering, I turn on the box fan, which amply circulates air from shower into the rest of the space. When I run the box fan for 20+ minutes, the shower area dries out just as well as the rest of the space. But this is unsightly, intrusive, and manual.
I have thought about ways to get make-up air (from elsewhere in the house) into the shower area, so that exhaust fan would pull air from the shower area. Broadly, I'd install some kind of grille in the shower, angled so that water drains down but air can come in. Grille would connect to a duct to some other nearby other part of the house. Don't feel great about this because it feels ad hoc, and access is limited behind the shower area. Also prefer not to cut tile, as I don't have any experience working with tile.
I also thought about ways to try to increase circulation in the shower area. I have excellent access from above (attic) so could install any kind of ceiling-mounted fan. Certainly wouldn't want a full ceiling fan. What about a tiny fan (potentially as small as a USB desk fan), mounted to ceiling or wall, controlled by the same switch that turns on the exhaust fan? I'm confident in my ability to mount and wire such a fan. Feel it would help the problem. Nonetheless, I'm hesitant. One, I feel like a code restriction would prohibit or limit such a fan in or around a shower. More than that, I've never heard of anyone doing any such thing. Why not? I can't be the only person with a dead-end shower area needing improved air circulation.