Open the browser settings menu (three dots or three lines).
Select Settings (or Preferences).
Find Privacy and security.
Select Private browsing (or Incognito).
Turn off Private browsing (or disable Incognito).
If there is no toggle, remove access by using device/browser parental controls or enterprise policy:
Windows/macOS: Use Microsoft Edge/Chrome/Firefox administrative templates to disable Incognito/Private browsing.
Android/iOS: Use parental controls or managed device settings to restrict Incognito/Private mode.
Restart the browser to apply changes.