Window >> Document toolbar >> Delete item / Clear items
OR
Tools >> Document >> Delete item / Clear items
To delete a single object, click on the Delete item icon, and then select the object in the view window by clicking the left mouse button (the object will be highlighted).Click again to confirm the selection and delete the object. To deselect the object, press the right mouse button.
To remove all objects, click on the Clear items icon.
Hotkey: Document.DeleteItem
Hotkey: Document.Clear