Hey @HumpyDumpy_5I!
So what’s happening here is you need your collision to START enabled. You just need to set the collision to OVERLAP pawns. Then once the player passes through, set the collision profile to “WorldStatic”, which turns it into a physical wall (use “Set Collision Profile” instead of “Set Collision Enabled”- it needs to always be enabled it just needs to overlap pawn).
Hope this helps!