A quick tip from Sebastian König, who demonstrates a useful but little known feature in Blender using the Sculpt UV command to easily reshape and move entire sections of UVs around much like sculpting in 3D.
A little known but very useful feature is Blender’s UV Sculpting
Sebastian shows how to use the Sculpt UVs to relax, Pinch, or move around UVs easily with what essentially is a sculpting brush, similar to the one seen in the 3D views, even using a lot of the same key commands.