Use the following options to set what happens when you select Mesh Display > Set to Face.
- Create face normals
- Select whether to unlock or lock face normals.
- Unlock vertex face normals
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The edges surrounding the vertex face are hardened if it is possible to do so, and the normals unlocked. This is the default setting.
- Match face normal
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When Match face normal is set, the vertex/face normal value is matched and locked to its current face normal.