When designing your content, you have the option to display widgets Full-Width (as wide as the page) or Half-Width (half the width of the page). 

Step 1

To change the width of a widget, you will need to go to Edit mode. 

Step 2

At the top of each widget you will see these icons on the top-right corner. 

Step 3

Click on this icon   to Shrink to Half-Width.

Or, this icon   to Expand to Full-Width.

Step 4

Click View at the top of your page to save your settings.