Dragging and dropping the Space widget onto your block adds a spacer to your email (Fig 1).


Fig 1

 

Clicking on the Space widget in the email brings up the Space Options (Fig 2). 


Fig 2


In Column Options, you can adjust the background color of the column the space is in or increase the padding,.


In Space Options, you can increase the height of the spacer itself (its default is 40 pixels). 


To learn more about the other sections within Widgets, read the corresponding article: