Click the Configuration icon (three lines with sliders) at the top right of the content frame.
Scan down the side menu to the section labeled Apply Quick Layout.
Select the quick layout most appropriate to your dashboard. You can also further customize the layout of widgets by following the Configure Widget Layouts guide.
Below is an example of before and after changing the layout with a quick layout option with four placeholder widgets.
Click the X at the top right of the configuration side menu to exit the edit view and save your changes.