No there’s no way to change the layout of an already created row (on a posts edit-page for example) since the fields in a layout can be (and should be, otherwise whats the point) very different. There’s no guarantee the same type of fields or fieldnames exists between different layouts so trying to add this as a feature would be pretty much impossible I think.
You’d simply have to create a new row with the layout you want and copy paste the values over and then delete the old layout row.
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