Capitalization of new line in Mail

How to Turn Off Auto-Capitalization of Words on Mac

How to Disable Automatic Capitalization of Words in macOS

1. Go to the  Apple menu and select “System Preferences”, then go to “Keyboard”
2. Go to the “Text” tab
3. Uncheck the box for “Capitalize words automatically” so that it is no longer enabled.

Turning off auto-capitalization takes effect immediately, much like enabling the features, and you can immediately start typing without words capitalizing automatically on the Mac.

While you’re in the same keyboard settings, you may also be interested in turning off auto-correct on Mac or even disabling the automatic period typing on Mac too.

How to Turn Off Auto-Capitalization of Words on Mac (osxdaily.com)

Sweet, take care my friend.:)