QUICK ANSWER To change the default font in Outlook on Windows, head to Settings > Mail > Compose and reply, then select your default font and size under Message format.

Fix CTRL+ does not increase Font size in Windows Terminal The problem related to the font size in Windows Terminal mainly occurs when your main keyboard layout is set to German.

Most Microsoft apps use the same font by default. However, if you want to always use a different font in one or all of your desktop 365 apps, you can change the default manually.