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How does Huawei p20 close the background?
If your system navigation is set to "Off-screen physical navigation key", slide the physical key left or right to enter the viewing background interface, and click the trash can button in the interface to clean up all background applications.

If your system navigation is set to "virtual navigation bar in the screen", click the □ button to enter the viewing background interface, and click the trash can button in the interface to clean up all background applications.