If the user watches the classroom in the cloud through TV and wants to switch cities, he only needs to exit the classroom in the cloud and reopen it. After opening it, he can re-select the city.
Skills of using mobile phone: Take Xiaomi 10 as an example. When using a mobile phone, if the user thinks that the mobile phone automatically locks the screen too fast, it can be set longer. Specifically, just turn on the phone, find the setting options from the phone desktop, and turn it on.
After entering the settings page of mobile phone system, open the options of information screen and screen lock, and then click automatic screen lock to select a longer time from the pop-up options.
Xiaomi 10 has dark mode. If the user wants to open it, he only needs to open the display option on the system settings page, and then click the dark mode to select Open.
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