Flip Face Edge
The Flip Face Edge action swaps the triangle orientation on the selected face(s) with four sides. This reverses the direction of the middle edge in a quad.

Use this to smooth ridges in quads with varied height corners.
Note: This only works on quads (four-sided polygons).
This action is often called Turn Edges in other 3D modeling applications.
From the main menu, select Tools > ProBuilder > Geometry > Flip Face Edge.
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