Why does the house sign appear on the desktop of Huawei p40?

A small house icon will appear when you press any part of the desktop for a long time, which is actually the reason for opening the desktop setting mode.

Equipment: Huawei P40

System: HarmonyOS2.0

1. First, click Settings on the phone desktop.

2. Enter the setting interface, then pull up the screen, find the system and update it.

3. Enter the system and update interface, and then click the right arrow of simple mode.

4. Enter the interface and click Apply.

5. Then the desktop becomes simple mode.