A pinned UV does not move when a UV mesh is unfolded. In general, you want at least one pinned UV when unfolding because it gives the unfold process a point of reference. This is similar to placing a pin in a piece of fabric so that it does not unfurl out of control as you unfold it.
6, Click Apply and Close.
Maya lays the UV mesh out across the UV space. Parts of it may fall outside the 0-1 texture space, but that’s fine for now. More importantly, notice that the pattern is much more even across the mesh now.