We had a customer who observed that when they used the iframe card in our Site/Page Layout Builder and they tried to use a Tableau URL that the Tableau chart would cause a lot of added horizontal white space on mobile devices. This seemed to be a result of using the fixed-width default layout option for dashboards. When we tried a Tableau chart that used the automatic layout setting, our iframe card resized normally for mobile and there was no extra horizontal white space as the Tableau chart scaled to automatically fit the available area of the iframe.
