Page Layout and Containers
The main building element of your website is the Container. It's the main widget that contains all your other widgets. You can add one from the '+' button on the side or on your page 'ADD BLOCK' -> 'Empty Block'
You can move the container and all the widgets inside from the 'Move' icon when you go on top of the container with the mouse. The 'Edit' icon will open the Edit Container settings. You can change backgrounds of the container.
You can also adjust the columns of the container. There's 5 possible columns with adjustable size. It is a nice way to arrange content for different layouts you may like.
You can also click at the 'Resize Container' button to make the content take the full width of the page.