How to change the default font in Microsoft Outlook from 'Calibri' to one you prefer more

To change the font in Outlook, head to the "Signatures and Stationery" menu, where you can pick from a number of fonts.

How to change the font size on your Android device, or zoom in the display to make everything larger

You can change the font size on your Android phone or tablet by heading to your device's Accessibility menu.
PC World

How to set the default font for headings and text in Word

Microsoft has changed the default font in Word with one of the latest updates. Instead of Calibri for normal text and Calibri Light for headings, the fonts Aptos and Aptos Display are now preset. If ...
Android Authority

Gboard might soon let users switch to a different font (APK teardown)

Gboard might soon get a new customization feature to help users change the keyboard’s font. A teardown of the Gboard app has revealed that the feature will let users switch from Google’s default font ...