How does oppoA9x find the pure mode?

OPPO mobile phone has no pure mode. here is how to set the desktop mode.

ColorOS11 and later versions, enter the settings >; Desktop and lock screen (desktop, lock screen and information screen) > Desktop mode, you can choose standard mode, drawer mode and simple mode. Coloros version 7.-7.2, enter Settings >; Desktop and music lock screen > Desktop mode, you can choose standard mode, drawer mode and simple mode. The function introduction of desktop mode. The standard mode is the default desktop mode of the system, and all installed applications will be displayed on the home screen. Long press the application icon to display application shortcuts, and you can manage or uninstall applications. In drawer mode, slide up from the home screen to enter the drawer desktop, and all installed applications will be displayed in the drawer, so that important applications can be moved to the home screen. In simple mode, a simpler desktop layout and a larger desktop icon will be displayed, and the font size of the system will be enlarged. The operation path may be slightly different due to different models and system versions, please refer to the actual operation interface display of the mobile phone.

this answer is applicable to all OPPO models.