Changing the size of the preview window
Mail Designer 365 allows you to set a zoom factor for device preview window:
When setting the device preview for example to 50%, you can have multiple device preview windows side by side on your display. In this way you can compare the preview for multiple devices at one glance.
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A Quick Tour of Mail Designer 365
Background
Layout Blocks
TextScout
Editing Text
Links and Buttons
Configuring Text Styles
Tables
Image Areas
Images
Using Retina Images with your Design
Graphics and Other Objects
Creative Tools
Advanced Design Techniques
Blend Modes
Optimizing your Template for Mobile
Plain Text
Preview your Design
Preparing your Design for Sending
Email Delivery
HTML Export
Other Sharing Options