Gotta keep the support speedy! 
You can lock your Arkio scene using the lock command found on your left wristband (I think the tooltip says lock position or something like that). This should keep your models and scene locked in place so you can move around freely without moving your content. If your headset isn’t anchored anymore when you remove it, try teleporting back to your spatial anchor to re-lock your scene. There should be a teal-circle wherever you created the spatial anchor, aim your teleporter there it should snap into position.
Also, we’re happy to have a new member of the community! 
@Paul if you’re up for it, say hello!
Hope this helps!