Solution:
"Developer options" refers to the system hiding functions that developers need to debug when debugging the system. When enabled, functions such as "ADB debug" can be enabled.
If needing to open the "Develop Options" option, here's the specific setting method: Setting>> About>> product model (click 7 times). Currently, Mi Box and MI TV only includes "ADB debug" function because the box and TV do not have the same functions as the phone. After opening "ADB debug", then can use the third-party computer software to install the software to Mi Box and MI TV or view the content location of the device as follows:
After turning on "developer options", setting >> account and security will display "ADB debug" option, and select "allow" will enable "ADB debug" function.