How to perform this?

I’d like to perform the change shown in yellow in the two images below but I don’t know how to. Edge befor spinning
After spinning

Select the edge, open the edge menu (Ctrl+E) and use “Rotate edge CCW”

Or you could dissolve the edge and then add an edge with the knife tool.

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I did that and this the way it behaved:

Ain’t that the change you wanted? (for the opposite side you would use rotate cw instead of ccw (clockwise instead of counter-clockwise)

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