You can use Mobile Formatting menu to configure displaying on mobiles. The settings of this section are only used to configure emails displaying on mobile devices.
You can set the font size for header, content, footer, info area, text size for block menu, headers H1, H2, H3, and their horizontal alignment.
You can also set text size for the buttons and enable their full width displaying and set email content margin.
Besides, you can add margins around the email for the mobile version.
You can also use options such as "Hide" element for mobile or desktop.
And align any block in the container for the mobile version. To do that, select the desired block, and click on the mobile icon in settings.
You can adjust the padding for any block/container/structure for mobile displaying, for that you need to click on the mobile icon and set the padding.
The default values for the desktop version of emails/templates are used for mobile view. So if you are not going to use the same padding or text/image/button alignment, click on the "Mobile" icon and set padding/alignment which you like.
Moreover you can disable the "Responsive structure" option for structures with 2 or more containers. In this case, you will see containers located in one row on mobile devices.
Please be careful with this option, if one of the containers contains a non-responsive image with large size or font size for the text, this can cause a horizontal scroll.