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I have a similar problem with my 2013 Accord LX. Here is what I found out.
1. Adjustment Knob only works when it's dark and I think it's connected to the light sensor. It only adjusts the brightness against Parking Lights, etc. for driving with lights on when outside is dark. Here is how it's done: In the Parking Position with the engine running and light switched to the second (Parking Lights, etc.) position, turning the Adjustment Knob left (dimmer) or right (brighter). You will see six circles at the center of the Instrument Panel, filled up when you turn the Knob to right, and hear a beep if the limit on each side is reached. The right beep also tells you that the contrast is off and the brightness is at its highest when the lights are on. There are a total of six positions and I keep it at the fourth position.
2. The manual says the brightness can be adjusted with lights on or off but does not tell how to do it when the lights are off. My guess is that Day/Night (Sun/Moon) button (with symbols of Sun and Moon on the left side of the CD slot) is used for both. Push the button repeatedly, you can switch it between Day, Night, and Screen Off. When it is in Day or Night, a row of bars is shown and you can rotate the Selection Dial to move the position of the brightness, which I think is for both the Screen and Instrument Panel because there is another place in Settings you can adjust every of the Screen. I keep both cases with the choice of the middle bar.
So if you keep the Adjustment Knob at a position, say the fourth position, and feel it's too bright when you drive during the day with lights on, you can lower the brightness of the Day setting described in Part 2 above.
Hope this helps.