Locks are set by the end user. The following doc explains the various locks in detail:
https://erwin.com/bookshelf/public_html/2020R2SP2/Content/Tutorials/Scenarios/Working%20on%20a%20Mart/Lock_a_Catalog_Entry.html
Either the user can remove the locks from the mart admin portal or from DM or as an admin, you can sign in to the mart admin portal and view all locks and remove them from the catalog manager tab.
You can find more information in the EDM 2019 R1 Workgroup Edition Admin Guide, topic "Lock Behavior", page 236.