After adding mirror modifier the other part of the chair leg has some shading problem. I have tried :

1. check face orientation 2.recalculate normals

Please help.

Shade smooth :

Shade flat :

Wireframe :

Face normal :

After adding mirror modifier the other part of the chair leg has some shading problem. I have tried :

1. check face orientation 2.recalculate normals

Please help.

Shade smooth :

Shade flat :

Wireframe :

Face normal : Blend file : https://pasteall.org/blend/eb989c31e7494803b4c9896fd88533b9