Reply To: Locking Sculpt Plane in Blender 2.9x?
Using Original Normal (that is: checking the box) does the same as locking the Area Plane in 2.7.
Same Tooltip and same Python code.
It seems that they changed the UI, but kept the old Tooltip, which makes it hard to understand that Tooltip 😉
Someone should change that (sounds like an easy thing to do).