Deleting content libraries
You can delete content libraries that you have update rights to. When deleting a content library, all library objects are also deleted.
Do the following:
Open the QMC: https://<QPS server name>/qmc
Select Content libraries on the QMC start page or from the Start drop-down menu to display the overview.
Select the content libraries that you want to delete.
Click Delete in the action bar.
A Delete dialog is displayed.