@phoebem I don’t know of any way to restrict your users from creating records here. This comes up in a few other areas of Gainsight, in various manifestations in the UI, and while Gainsight has added a few more guardrails in terms of record creation, I don’t believe you can stop users from creating a linked record inside a CTA.

Here’s where good process, clear enablement, and probably a Report to watch for any records that don’t belong can cover you until Gainsight provides the functionality you seek.