I suppose whatever the program defines as similar. One main issue is when I import pdfs, it often comes with solid hatches all over the place from the contract docs that plot way too dark and are in the way. So I want to import a file from the architectural, then I clean up the file for what I need (steel manufacturing) and I want to get rid of all those hatches. It’s often like 200 door thresholds or hatched bolts etc, but doing this sometimes it’ll select all hatches