Enable the From field when managing multiple accounts

To enable the From field in Outlook 2019, follow these steps:

1. Open a new email message in Outlook 2019
2. Go to the "Options" tab in the message window
3. Look for the "Show Fields" group
4. Click on "From" to display the From field in your email composition window

If you don't see the From option directly:

1. In the new email window, go to the "Options" tab
2. Click on "From" in the ribbon (if visible)
3. If not visible, click "More Options" or look for an expansion arrow in the "Show Fields" section
4. You may also need to click on "Show From" or a similar option

Once enabled, the From field will appear in your email composition window, allowing you to select which email address to send from if you have multiple accounts configured.