Add-on: QCAD Professional Menu: Modify > Detection > Detect Duplicates
Shortcut: M, D
Commands: duplicates
Description
This tool can be used to find, select and optionally delete identical
entities in the current drawing.
Usage
After launching the tool, the options tool bar displays controls to enter
tolerance values for the comparison of entities. Adjust these if
appropriate.
Tick the option "Ignore Layer" if you want two identical entities on
different layers to be considered equal.
Click the refresh button to run the search again if you have made any
adjustments to the tolerances and the "Auto" check box is not checked:
If the "Auto" check box is checked, the search for duplicates is
automatically repeated if you change any of the options.
Click the delete button if you wish to delete the selected duplicates: