How do I disable cursor on Android??

Hello, I am trying to use a mouse for movement in a FPS android game, but when I connect a mouse to the android phone the mouse cursor shows and it is bound to the screen edges and restricts my character's movement. Ive tried Cursor.lockState = CursorLockMode.Locked and Cursor.visible= false but that didn't work. Is the another solution?? Is there a way to disable the phones background functions??

 

Looks like this is not possible on android :/