On my version of Outlook (Office 2019 if I follow the directions in the article you cite, I only get options for saving Drafts
I don't have Outlook 2019, so I can't verify, but both articles have, under "Applies To" at the top of the page:
Quote:
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Outlook for Microsoft 365 Outlook 2024 Outlook 2021 Outlook 2019 Outlook 2016
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So I'm not sure where we went off the script.
The setting I'm most interested in is "Change the account used to send email messages".
Change the account used to send email messages - Microsoft Support
My guess at this point is that you are Sending from an account other than your "Main" one.
If you do File > Account Settings > Account Settings, on the "Email" tab, is there more than one account? If so, which one is marked with the Default?
If you do File > Options > Mail. Under "Send Messages", is there a checkbox for "Always use the default account when composing new messages"? And is it checked?