How to turn off the screen of LeTV mobile phone?

The appearance of this phenomenon can set questions every once in a while. First, make sure it is the following video software.

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Letv's expression pop-up window looks like the screenshot below, as shown in the figure.

Find the video pop-up settings in the lower left corner of the player, and then close the pop-up window, as shown in the figure.

Then it will disappear, as shown in the picture.