Thank you! For sure the lasers distract from the experience, I'm used to Unity where when we disable a Canvas, it can't be interacted with. In Godot XR Tools, it still works despite being hidden. (I thought about putting a rigidbody in front of it, but that was enough hacks)
The main scene was built upon the rumble demo one from the template. Once I managed to trigger the body resizer on the left wrist, the "return to main menu" button probably still works too x)
I spent a lot of time discovering how UI works in Godot, yet it is still very barebone in my project