The iPhone’s “Accessibility” menu for as long as the menu has been available, was in the “General” settings, but not in iOS 13.
While Accessibility is located within the General page of the Settings app in iOS 12 and under, Apple has since grown to realize just how important the setting is. It’s included more essential options such as Voice Control, a totally hands-free experience, and in doing so, the Accessibility menu has moved to a more prominent spot — the main Settings page. In doing so, Accessibility has also been cleaned up and organized, so there are more sub-menus, so options inside have also moved.