Here is the before and after of adding a face to a model of a cabinet. All i did was select four verts and press F.
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3It looks like the newly added face has its normals facing the wrong way, thus causing shading problems. Select the whole object in edit mode and press Shift+N (recalculate normals outside). – Christopher Bennett Oct 01 '22 at 04:55
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1Or do you mean the shading in general? The top image looks like the object is shaded flat, the bottom looks like shaded smooth. Right-click on the object in Object Mode and select Shade Flat. – Gordon Brinkmann Oct 01 '22 at 09:52
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@ChistopherBennett I tried that and nothing changed. I tried both outside and inside recalculation and flipped to check. – Connor Markus Oct 01 '22 at 22:40
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Does this answer your question? display face normal direction in blender 2.8 – Emir Oct 02 '22 at 01:47