How Does Outlook Profile Information Work for Custom Domain Email Accounts?

Hi everyone, I am using Outlook with a professional email address connected to my website/domain, and I want to better understand how profile information works for this type of account. I am specifically trying to know:

• Where Outlook pulls profile details from for a custom domain email
• Whether profile information is managed in Outlook, Microsoft account settings, or Microsoft 365 admin settings
• Which profile details are visible to recipients when sending emails
• Whether there is a way to personalize the account profile for a more professional appearance

  I am looking for guidance especially for accounts using a domain-based business/professional email rather than a regular personal Outlook address. Thanks in advance.