Samsung has announced the Galaxy Z TriFold, a foldable phone comprised of three ultra-thin (~4mm) panels and two sets of hinges, that unfolds into a 10-inch tablet. When closed, it resembles a standard smartphone with a 6.5-inch display that is 12.9mm thick. Because the main screen is so large, Samsung has created a "standalone" version of Samsung DeX, meaning it can switch to a PC-like desktop mode without attaching ...
Mine grew a visible line at the foldy bit that you can see at an angle.
I like the phone though, just know what you’re getting into.
My understanding is that’s normal on all foldable. It can be more or less, but it’s on all of them.