I cant Flatten sheet of this part. How can I Flatten sheet this part?
It really just makes sense to unfold something with a uniform thickness. Your edges has a hook shap that won't unfold.
I am on 2020 so I can't see your features, but it will be able to flatten only if it is created with Lofted-Bend feature.
Here I am attaching link to download the file after flattening the surface.
I hope it will be helpful.
I can't open your file as it's SW2021:
But I attached an SW2019 file that uses a formed lofted bend from a line sketch and an arc sketch:
Retrieving data ...