Check Duplicates Add-On

By installing Goodies Add-ons, you can use Check Duplicates option. It can find, select or delete items sharing the same parameters (type, color, thickness, height, etc…) and occupying the same spot on the floor plan. Unwanted doubles are typically created by either accidentally double-clicking at the same mouse position or by copying and pasting items several times to the same location. You can select it from Edit > Check Duplicates.