Check the responsiveness of the page in either of the two ways:

1. When working with the layout of the page, click on the Screen icon in the bottom right corner of the screen. A list of possible device options will fold out. Select a device. Your Buildify work area will get resized correspondingly.
2. When customizing a widget, click on an icon of a device next to the widget name. Nearly every widget has three icons: desktop, tablet and mobile phone. Your Buildify work area will get resized correspondingly.