Changing orientation on mobile ads
In some cases you may wish to have a mobile ad that responds to orientation changes, with separate landscape and portrait layouts. Google Web Designer lets you handle this in two ways, using either responsive layout or an alternative page.
1. Responsive layout
2. Alternative pages
You can create alternative orientation pages for each page by going to the Page properties section of the Properties panel, and setting the Alternative Page to the page ID of the page with the opposite orientation.