Enable from field in Outlook

1. Click on new email button

3. Click on the 3 dots, then click on From

This will now show the From field, if you now click on the from button and other email address. You will get the option to enter email address you would like to send from.

The next time you use the From button you will see a list of previous emails that you have used before. Which you can now select from the list.