It might be useful to have an option in the canvas studio to show the outlines of all controls on the screen. This would assist to see spacing and alignment at a glance without having to click on each control. Currently if a control's border is set to 0, it is not easy to see exact which area of the screen the control consumes. The outlines could be shown in a light intrusive grey or dotted line.
Below are two examples:
Current situation for controls without borders
Current there is now way to see exactly which part of the screen the control consumes
Proposed example how it might look to show control outlines
This would allow to easily see control positioning