Before you start
Things you need to know:
You can only change the width of campaigns that originated from pre-made templates in Dotdigital.
You can't change the width of any templates you build or upload yourself outside of EasyEditor.
Change the width of your campaign
To change the width of your campaign:
In EasyEditor, select the Styles tab and expand the Email width menu.
The email width can only be set if the template is marked up to be resizable – marking up your campaign to be flexible width.Select either Large, Standard, Small, or enter a custom width.
Custom width must be between 400 and 800 pixels.