I have converted a CAD file to GIS format using GIS (from .dgn to .shp)... In one layer I have polygons in which a smaller one is on top of the larger polygon. I can see both polygons however when I select the smaller polygon, the software automatically selects both the smaller polygon and the large one.
IS there anything I could do so that when I select the smaller one, the larger one doesnot get selected?

I don't want to select both and then unselect one of them.