how to disable privatte browsing on 2021 iPad Pro

See the following from Browse privately in Safari on iPad - Apple Support

You can use Private Browsing Mode to open private tabs, which don’t appear in History on iPad or in the list of tabs on your other devices.

Tap , then tap Private.

While Private Browsing Mode is on, the search field background is black instead of white and sites you visit don’t appear in History on iPad or in the list of tabs on your other devices. You can open multiple private tabs in the Private Tab Group.

To hide the sites and exit Private Browsing Mode, tap , then switch to a different Tab Group. The tabs reappear the next time you use Private Browsing Mode.

Note -- if you don't have any other tab groups, tap Start Page after tapping