I wonder if it would make more sense for the previously-traversed UI to move off to the side, rather than having the user move to follow it, as a way to reduce

I wonder if it would make more sense for the previously-traversed UI to move off to the side, rather than having the user move to follow it, as a way to reduce the amount of mouse travel required from the user. They'd always need to move some, especially when the new options would otherwise move off the screen, but in general this would require less movement.