deleting a uv.

How do I delete the thing on the left? It’s the unwrapped version of the building to the right. Need to start over and unwrap it again, but don’t know how to delete the thing on the left…

Just unwrap again but with the appropriate seam placement to over write the existing UVs
or U / reset to reset the UVs
or in the Object Data panel under UVs use then - button to remove the current UV Map

Appreciate it, thanks!