What Does This Button Do?

I have a Scorptec Fusion RTX 4060 Ti Gaming PC and I want to know what the button on the very left does. I am also wondering if there is a way to turn off the rgb lights by button? I cannot login to turn them off as the PC is not working properly.

I have a Scorptec Fusion RTX 4060 Ti Gaming PC and I want to know what the button on the very left does. I am also wondering if there is a way to turn off the rgb lights by button? I cannot login to turn them off as the PC is not working properly.