Can not delet face in side of boundary?

I want to delete face inside of boundary as marked. Can I not select the face?

saw horse side hole issue.skp (199.0 KB)

Select the whole thing, right click and choose Intersect Faces>With Selection. You’ll see the edges bounding the hole go to thin normal edges. Then select the face inside and hit Delete.

Hole

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that worked well, thanks a lot

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