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 "Edit View"
2. 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