Open developer options mode
Open the settings, enter about mobile phone in the search box, click about mobile phone to enter the page about mobile phone;
Click the EMUI version number or HarmonyOS system version number 7 times continuously and quickly until a prompt appears, prompting you to be in developer mode!
The developer option can only be turned on in owner mode, and neither the sub-user nor the privacy space can turn on this switch;
In the student mode, when using the mobile phone/tablet healthily (this is the child's mobile phone when the child uses it), you can't turn on this switch.