outlook app on Ipad

The Microsoft Support pages are where you will find the most comprehensive information for Microsoft products and Apps.

This support page describes folder management:

https://support.microsoft.com/en-us/office/working-with-message-folders-in-outlook-com-6bb0723a-f39f-4a8d-bb3f-fab5dcc2510a?ui=en-us&rs=en-us&ad=us#__toc383432840

If you're using Outlook app, I suggest that you contact Microsoft Outlook support team and ask them.

Regards

Giulio