This will tell you how to switch between left and right handed mode.
In this, I will be talking about the physical location of the button, not the "logical" mapping.
Identify which button is mouse button 6.
Button 6 is the button on the right hand side of the mouse, closest to you.
Button 6 is the button on the left hand side of the mouse, closest to you.
Press and hold button 6 and the middle mouse button for a few seconds until it flashes white
Once flashing white, release the buttons and then press and hold button 6 only until it flashes red. The timing on this is difficult, so keep trying until you get it right.
While flashing red, you need to complete the following sequence:
Press the left mouse button then the right mouse button Ducky Feather Mouse Switch Left Right mode
Press the right mouse button then the left mouse button