Solved
Meta All in One SDK v66 claims to allow us to disable the boundary in code
https://developer.oculus.com/downloads/package/meta-xr-core-sdk/
"66.0 - Release Notes
What's New
Boundary API
-
The Boundary API enables developers to suppress the boundary visibility, allowing users to go beyond the Guardian Boundary. The feature is closely related to Passthrough: The boundary visibility can only be suppressed when a Passthrough layer is rendered."
The official API docs only refer to v65. Has anyone managed to do this? If you have, would you be so kind as to tell me how please? I'm trying this
private OVRManager ovrManager;
ovrManager = FindObjectOfType<OVRManager>();
ovrManager.shouldBoundaryVisibilityBeSuppressed = true;
but the boundary still appears.