How to set inner spacing:

To set inner spacing, first click on design mode. Next, click the spacing tab and choose a zone. Then, hover over the zone and click the pencil icon. After, choose override from the drop-down menu. Then, click the sides you desire and type in the pixels or use the slider.

Here is how to set spacing between elements

Step 1: Click the design tab. 

Step 2: Click Spacing tab (A). 

Step 3: Choose a zone (B). 

Step 4: Hover over the zone and click the pencil icon (same as editing a widget)

Step 5: Choose override (in red)

Step 6: Click the sides you desire (E). 

Step 7: Type in the pixels or use the slider (F)