Use Delete 
to delete a block of objects after it has been selected using one of the block selection methods (Box Select, Freehand Select, Point Line Select or Select All). Alternatively, use the Delete key.
This function differs from Cut because it does not place the objects on the Clipboard Block. Therefore objects that have been Deleted cannot be pasted into another drawing (although Undo can be used if the wrong objects are deleted).
Deleting Single Points
Use Delete Points
to delete individual points.
Shortcuts
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Draw Tab, Clipboard:
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Keys: Delete; Alt, D, DE