Sign in features 2 extensions for changing video mode:

App Store download link:

Picture-in-Picture Video Extension activates PiP in all apps on iPhone and iPad:

Fullscreen Video Extension

Besides Picture-in-Picture Extension, also contains a Fullscreen Video Extension, which has 2 purposes:

App Store download link:

Native Fullscreen UI

Sites and apps like YouTube, Twitch, Vimeo, Facebook and others use custom fullscreen interfaces on iPad.

Websites provide HTML based interfaces which are less responsive compared to native iPadOS fullscreen UI and lack useful features.

YouTube HTML fullscreen interface:

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store