2.82 unwrap dont project in UV Editor

What did wrong checked / unchecked in blender ? I have no unwraping in my UVEditor ?
I am on 2.82 - with default / Load Factory setting

The primitive cube created in the scene has position coordinates and UV coordinates defined in code.

However there are no “Marked Seams” so the unwrapper doesn’t have a clue how to unwrap the model.

To unwrap a model you would have to select edges and mark seams.
2020-02-26 23_40_36-Blender

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Thank you . I though the default cube had ‘integrated’ seams because of the first successful unwrap before reset. You are right, seams are necessary on default meshes .