Picture-in-picture (or PiP) is a feature that iPhones have had since iOS 13, and iPads since iOS 9. YouTube, being YouTube, is arriving fashionably late to the PiP party; it announced in June that it would bring the feature to Apple devices for both Premium subscribers and regular users, and just started rolling out…
Source: LifeHacker – How to Finally Enable YouTube’s Picture-in-Picture on iPhone