Didn't know that either, of course making them invisible after you run the sim is ok.

The cloth room luv it but it drives me nuts at times, seems you have to plan everything in your scene around running a sim, I just had a really nice skirt sim set up on a character, imported my ready made animated 2nd figure (dressed in conforming clothes) and bam! the skirt became a bag tied round the wearers head. Had to delete and start from scratch with new copy of the skirt, new simulation.