This is the development option of the android screen. Probably someone from the production forgot to reset your machine before packing it 
If you want to āhide itā, just go to Experiment -> Preference -> reset all. This option would clear out the 3D printing calibration, probably from the laser as well. But not the EEPROM from the controller, thus the setting done through serial by using G and M gcodes.
If you want to activate the development option again (for example to dim the brightness of the screen), Go to setting -> about machine, and then tap on the screen about 5 or more times consecutively. So basically how you activate the development option on a standard android as well.