Heya Carlosan! I meant more like hiding everything that isn't selected. For example, in 3Ds max, if I wanted to work on a particular subobject section in a mesh, there's a 'hide unselected' button that will hide all polygons/verts except for the selected section.
So currently, if I want to work on a subsection, I would have to hide the selection, then invert hidden. For example:
So being able to hide everything except for the selected UV island with one button would make things more efficient. Even cooler if I could just select UV islands from the preview window and show only that section in the viewport. But, hopefully I explained myself a bit better.