The post shows how to edit the default signature in the Outlook (new) App for Windows 11/10 and some other options provided in the new Outlook app Settings..

Adding emails into the Windows 11 Mail app After you click the Mail icon, a new window will pop up with a list of email servers to add. Select the option for your email address.

You can create and add signatures to new messages, replies, and forwards in Outlook.com. Here is a complete guide showing you how!

WIndows 10's Mail app includes a "sent from Windows 10 Mail" signature by default. Here's how to change that or remove it.