How to merge or hide the metal line from same metal layer in layout?

In a metal layer, whenever we need to add via than layout add a rectangle across the via areas. So when we fit it to window, layout looks like small rectangle boxes of same metal layer which doesn't looks good and also the continuity of metal looks like it has some disturbance at those areas. Is there any way to hide these rectangle boxes created due to via? Or Is there any way to merge the boundary to metal layer?