Found in https://bugfest.folio.ebsco.com
1) Assign "Calendar: Create calendar events" permissions to a user. This is the only Calendar permission that has been assigned.
2) Logout and login as this user
3) Go to Settings --> Calendar --> Library hours --> HB Infodisk
4) This use can perform any operation with the library schedule - Create, Deleted, Edit.
Also, Delete button available with any permission. It should be visible only if the following permissions has been assigned:
Calendar: All permissions
Calendar: Delete calendar events