1. Press the menu key on the projector remote control to enter the main menu interface, and find related options such as settings or advanced settings.

2. In Settings or Advanced Settings, find related options such as horizontal adjustment or lateral correction.

3. In the option interface of horizontal adjustment or horizontal correction, find the related options such as permission or permission setting.

4. In the permission setting interface, select related options such as open or unlock as needed to open the horizontal adjustment permission.