Hello SwamZM
Hi, I'm Karl and will be happy to help you today.
If you are asking how to start over from scratch, the best approach would be to create a new Outlook profile and configure the email accounts again using the Control Panel Mail app. While there are ways to reset individual items, there is no one single option to "reset all Outlook settings".
a) - With Outlook closed open the Control Panel <Mail> app
Just in case you need info regarding how to access the Control Panel Mail app, that's described in the following article by Outlook MVP Diane Poremsky
Where is the Control Panel Mail icon?
https://www.slipstick.com/how-to-outlook/where-...
If using Windows 11
How to Open Control Panel in Windows 11
https://www.lifewire.com/open-control-panel-in-...
b) - Select <Show Profile> --> <Add> --> give the new profile a name (no need to remove the existing Outlook profile)
c) - Configure your email account(s)
d) - Set the newly created Outlook profile as the default for the next time Outlook is opened otherwise it'll use the old profile