You can delete fragments that are no longer needed.
Warning
Fragments are not just removed from the Fragments bar, they are really deleted. If you have deleted a fragment, you need to create it again if you wish to reuse it.
Procedure
In the Fragments bar, right-click the fragment you wish to delete.
Click Delete fragment. The Delete fragment confirmation prompt opens.
Click Yes.
The fragment is deleted and removed from the Fragments bar. Of course, the model items created using this fragment remain unchanged.