You have the option of automatically hyphenating your text to avoid layout problems:
Of course, you can also turn off this feature.
To access this feature, try the following:
Choose “File” > “Design Options…” from the top menu bar.
Then, check or uncheck the box next to “Force hyphenation.”
Click “Ok” when you are done.
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A Quick Tour of Mail Designer 365
Graphics and Other Objects
Working with Links and Buttons
Optimizing your Template for Mobile
Using Retina Images with your Design
Preparing your Design for Sending
Setting Up Mail Designer 365 for Sending
Send via Mail Designer 365
Advanced Design Techniques
Exporting a Design to MailChimp
Exporting a Design to Campaign Monitor
Appendix: Keyboard Shortcuts