1999 Volvo S70 Headlight adjustment

Recently purchased a 1999 Volvo S70. One headlight is pointing to the trees. Reading the owner manual it notes something like."Look into the clear window on the top of the headlight lens. You will see a 'level'. Use the headlight adjustment knob to reset the 'level' to zero".
The manual does not offer any diagram of where the "window" is on the lens. I can not see anything resembling a clear window anywhere on the lens. Further the manual does not identify any adjustment knob nor can I see anything that appears to be an adjustment device.
The question. How the heck do I adjust the dang headlight?

thanks