Different buttons show up or hide depending on how you’ve touched the youtube screen. It can be frustrating to figure out what you need to do with a video, like make it full screen.
At first, this video will look like the below picture. Notice that there are no controls on the screen, just the video. It may be playing or it may be paused.
If there are no controls on the screen, touch the video.
Now controls will show up on the video screen.
Touch the little square brackets and your screen should go full size.
At the bottom right, the brackets are now closed in a little plus sign. To make the video small again, touch the little plus sign.
Tech Talk by SeeMallardMedia