Check out example codes for "unity hide mouse first person". It will help you in understanding the concepts better.
Code Example 1
void Start()
{//Makes it invisable
Cursor.visible = false;
//Locks the mouse in place
Cursor.lockState = CursorLockMode.Locked;
// In unity press esc to unlock the mouse and unhide it
}
Learn ReactJs, React Native from akashmittal.com