1, explore the desktop, the middle of the screen slide into the interface of all applications, long press the application, drag to the upper right corner of the screen "open small window" above the four words, you can open the small window.
2. When you are in the apps interface, slide up from the bottom left corner of the screen (near the side) to enter the all apps interface, long press the app icon, and wait for the icon to hover in the apps interface, then let go, you can open the small window.
3. Swipe up and hover at the bottom of the screen to enter the card background, click the arrow on the right side of the app's name, and then click Small Window (only apps that support Small Window mode will show the word "Small Window").
4. When playing games, you can slide your three fingers up to bring up the picture-in-picture window.