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Currently, you can only change font sizes to even numbers (12, 14, 16). We have customers who want odd sizes as well (10, 11, 12, 13, 14, 15, etc.)
Category: Email
STATUS DETAILS
Under Review
Ideas Administrator

Thank you for your feedback.
This is a great suggestion! This functionality is currently under review.

Sincerely,
PM, Dynamics 365 Marketing