How to maintain the edge


I’m a noob, so bare with me porfa. How do I sculpt on one side of the cube without causing deformity around the corners. I am trying to maintain all edges of the cube but sculpt on only the flat surface. I tried to mask but it doesn’t seem there is a precise way to mask the vertices or edges.

Select mask tool.
Top Menu: activate Facegroups on tap
Then tap on the face you want to sculpt. → then the face is masked
Then tap invert … then you can sculpt only on the face you want…

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