The title URL can be edited on the local tab individually. To change multiple titles in a collection locally, download the KBART data for that file and correct the links in Excel (or a text editor) then re-upload the corrected file.
To request a global change to the collection, contact OCLC Support with your symbol, the name of the collection that the URL change is impacting, and the vendor name. If work hasn't already been done by the WorldCat knowledge base team to correct the change, they will enter a request to have it done for that collection.
There is more information on downloading and editing collections using KBART.
There is more information on editing global collections.