Incognito mode is a feature and not an option so it cannot be de

Incognito mode is a feature and not an option so it cannot be deactivated. Especially as you have an iOS device. If you were on Windows, you could've tried some methods, which are not a good fix "do at your own risk and luck" thing, it will not be successful. You can manage the browsing activity using any Parental controls or anything that suits it. Incognito mode stays there and cannot be disabled.