When your in HMD mode you can move hud items.
Edit buttons. and other buttons. When the are good in HMD mode and you switch back to desktop ode the can be outside of the screen or to the edge.
High Fidleity need to remember ind esktop mode where the huds are placed. a also in HMD mode. and use the correct settings when you switch between both. That way the hud is always correct placed.