There are two methods to change the backlight to white.
1.Set it on Launcher.（How To Use Launcher To Program Your Keyboard）
a) You can refer to this link. Connect the K3 Pro to the launcher.
b)Click on the "Lighting" tab, and you will see the "Color " column. Please click on the small color box on the right and choose the desired color.
2. Press fn+F several times to reduce saturation until the lights turn white.