There are 3 options for Orientation:
Any: it can be either Landscape or Portrait, the ad will adapt based on the max width that you have set.
Portrait: Ad will adapt when it detected whether the device is in portrait and its width is less than the max width you have set.
Landscape: Ad will adapt when it detects whether the device is in landscape and its width is less than the max width you have set.
Please follow instructions below to adjust Orientation:
1. Click on Viewport followed by +
2. Input the name, size, max width and orientation (e.g.: Portrait display is 320x480 and Landscape display 480x320.)
3. Once you finish editing, create your landscape design on the second canvas
4. When all steps are completed, hover your mouse to the top-right and click Save followed by Publish.