how to change the brightness on my third monitor

Question

no option to change brightness settings on my third lenovo monitor.

Answer 1

Hi, I'm Rodrigo and I will help you.
Windows will not show brightness control for external monitors, but you can install third-party applications that allow changing the brightness of displays connected via HDMI/DisplayPort/USB-C.

Here are some examples of free apps that do that you can install from the Microsoft Store:

Twinkle Tray

Monitorian

Answer 2

On Windows 11, the built-in brightness slider only controls the built‑in display or a single designated panel. On most desktop setups with external monitors (like a third Lenovo monitor), Windows will not show a brightness slider for that screen.

For external monitors, brightness must typically be changed using the monitor’s own controls:

1. Use the physical buttons or joystick on the Lenovo monitor (usually on the bottom edge, side, or back of the screen).
2. Open the monitor’s on‑screen display (OSD) menu.
3. Navigate to Picture/Display settings and adjust Brightness there.

Windows 11 notes that the brightness slider might not appear at all on devices with external monitors, and in that case the only supported method is the monitor’s hardware controls.

If this is a laptop with multiple displays and brightness controls used to work differently, updating the display driver may help overall brightness behavior, but it will still not add per‑monitor brightness sliders for multiple external screens.

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References:

• Change display brightness and color in Windows
• How to use multiple monitors in Windows
• Supporting brightness controls for external display connectors