There are a couple of ways to create a Landscape View. One is when you first create your View.
1. Create a New View
2. On the screen that appears choose the orientation of your view. Landscape or Portrait. Portrait is the default selection when you create a view.
If you want to change the orientation of an existing view do the following:
1. Click on the 3 dots next to the View or Layer and then click on "Configure"
2. In the "General" tab of the View or Layer change the orientation to "Landscape" or "Portrait"
If you want to change the orientation of a Layer simply click on "landscape preview" above the device View in the builder.
SEE ALSO: How to Switch the Orientation of a View