How to lock my screen when watching youtube

- How can i lock my screen while watching youtube
- How to lock my screen while watching youtube
- How do i lock my screen when watching youtube
- How to lock my iphone screen while watching youtube
- How to lock my screen on youtube
- How to lock my screen on youtube iphone
- How to lock my screen on youtube kids
- How do i lock my screen while watching youtube
- How to lock screen while watching youtube
- How to listen to youtube with screen off