You cannot change the colour.
Below the mouse it has ONE switch for off/on/RGB-on. It changes colours automatically and reduces the battery life considerably.
There is no official software to change the RGB or programme the buttons differently.
RGB only lights up when the mouse is stationary. If it is moved, RGB goes out.

To change the colour of the mouse's RGB, it is usually necessary to use specific software provided by the manufacturer or dedicated hotkeys. However, I have no specific information on how to change the RGB colours for this mouse model. I recommend you consult the product manual or the manufacturer's official website for detailed instructions.