https://wccftech.com/ipados-13-features-mouse-support-as-an-accessibility-feature/

iPadOS 13 adds mouse support for the Apple iPad and it is an accessibility feature. But there is one more thing you should know about.

Apple’s direction for mobile has become pretty clear today. iOS is for the iPhone and iPadOS is for the iPad. The latter has a few extra features that immediately stand out compared to the iPhone version of the OS. For example, you can pin widgets directly on the home screen, which is a great deal if you love to see everything at a glance without having to swipe to a dedicated widget page. Also, Apple has added mouse support for navigating the display. This option can be found under the Accessibility pane in Settings > General.