Tamara of the Alliance wrote:
Ex Libris Support and other ELUNA libraries confirmed that GESs are the only way to hide the Resource Sharing form for specific records on the services page, and there are no plans to change the behavior.
Since this is the case, I've developed an AngularJS customization that uses the SRU to check for physical records in our Network Zone using the OCLC number or ISBN in the PNX/URL, and then destroys the Resource Sharing form button or lists the partners with holdings accordingly: https://github.com/alliance-pcsg/ve-central-package/blob/3f15ae26ff5676c5d0ca03f11deea787c2bea24b/01ALLIANCE_NETWORK-CENTRAL_PACKAGE/js/custom.js#L1179