UE5.7 Modular Control Rig: Can't Open Forward Solve Rig Graph to Blend ABP Input Animations

In UE5.7, I’m using a Modular Control Rig (with VehiclePivotProxy module). The rig is linked in an Animation Blueprint via the Control Rig node, where I pass variables and layered animations. I need to edit the main Rig Graph (Forward Solve) to copy the input pose from ABP’s layered blend and additively apply procedural constraints, without overriding the anims.
Problem: No “Rig Graph” tab visible, and in My Blueprint, right-clicking “Forward Solve” gives no “Edit Graph” option. Window menu has Sequencer, Graph Explorer, etc., but nothing for Rig Graph.
Tried: Enabling “Spawn Default Blueprint Nodes” in Preferences, resetting layout, recompiling, restarting. Module graphs (e.g., VehiclePivotProxy Connector Event) open fine, but not the main one.
How do I force-open the Modular Control Rig’s Forward Solve canvas for ABP input blending?
Thanks!