The new Design editor is more mobile responsive than ever.
There’s a mobile view within the editor itself. You’ll be able to see how your campaign looks like on a mobile device, so you won’t need to send any campaigns to yourself to check how it looks on mobile.
There are a few other functions you can use to make the mobile view even more attractive. One of them – the ability to hide elements if the campaign got opened on a mobile device.
Or, you can choose to break elements in the section so that they’d line up instead of being next to each other
As you can see elements that are next to each other will line up one after another in the mobile view. That is done in order to maintain a good quality of your images and retain the best view possible on the mobile device.