I guess this border is introduced in order to see more clearly which control is selected. However this selection border now hides the border of the selected controls and for this reason you need to deselect the control to see how they are aligned with other controls or to view how the placement shows is within the design.

And if the control is not place how you want, you need to select it again, move it a little with the arrow keys, deselect it to view the result, etc.
In earlier version of Access, without this orange border, this works way better, faster and more precisely.