Tips - Turn on the ruler when composing an email message

If you like to have rule view similar to Word when you write new email here it is official Microsoft article that well explain how to enable it:

https://support.office.com/en-us/article/turn-on-the-ruler-when-composing-an-email-message-162d5ab2-f743-4f1f-818f-d7f1e996b1df