1. Open mobile phone settings: find and click the "Settings" icon in the main interface of Xiaomi mobile phone.
2. Find the option about mobile phone: In the settings application, slide down to find and click the option about mobile phone.
3. Trigger the developer option: On the "About Mobile Phone" page, find the "MIUI Version" or "Version Number" option, and click it 7 times in a row.
4. Return to the previous menu: after the developer option is triggered, return to the previous menu.
5. Find and enter the Project Menu: Find the option of "Project Menu" or "Project Mode" in "Developer Options" and click Enter.
Please note that the project menu is specially designed for developers to debug and optimize equipment performance. Therefore, for ordinary users, it is not recommended to change the settings in the item menu at will to avoid equipment failure or data loss.