Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hi, Sandra Brennan
Good day!
Thank you for posting to Microsoft Community. We are happy to assist you.
According to your description, the issue of your concern that you would like to add additional columns in Inbox on your OWA - Outlook Web App.
Based on our tests and searching, it is not attainable to add columns in Inbox.
We truly understand that you would like to have more customization on OWA - Outlook Web App.
Since it is approaching into the design-level that we could not do much for you, thus, we would like to raise you to share idea and suggest this as a new feature in here - Microsoft Outlook Web App Feedback.
We hope your voice can be heard into Outlook's engineering team's ears.
Moreover, please feel free to share the link with us (once you posted as a new feature) and we're glad to vote it for you.
Thanks for your precious time and your understanding would be highly appreciated.
Have a nice day,
Alex | Microsoft Community Moderator.