I have always found it strange that SW does not immediately graphically show that a sketch is closed or open or has both. Do to this, I sketch always with auto relations on which limits the amount of dangling lines resulting in both open and closed sketch segments. But I wanted to see if others have good solutions to this problem that can come up, not including the normal test of creating a feature, which will tell you if it is closed or not.
Thanks,
Jonathan
SolidworksSketching