Posts. And iirc, it only hides them until you refresh.
I prefer it, because it allows me to explore and be exposed to more posts, especially if it is a slower day. I can just mark/favorite a post I found funny or interesting, which allows for faster searching anyway.
Tbh, I don’t particularly enjoy the way it looks and when I used it there were a few quality of life things, like hiding read items. But could’ve changed now
Don’t have the Fold but the Flip 3. I’d say it is pretty much as resistant as any other phone I had. If not more so because the main screen in protected when folded