When working on the rocket in other than "Fit" zoom, when a change is made to a component characteristic, the rocket re-centers in the design window. For example, if you zoom in on the motor mount so that you can make changes in the centering ring spacing, when a change is made in the placement, the rocket re-centers in the design window and you have to move the view back to the motor tube to see if the change is correct.

The desired behavior would be to keep the area being viewed the same (unless perhaps the change lengthens or shortens the rocket) so that you can change multiple characteristics without having to move the view window back between each change (very annoying).