Change Display preferences on Mac
On your Mac, use the Display pane of Displays System Preferences to adjust resolution and brightness, and to set display options.
Note: Not all options described here appear for all display models, and some options appear only when your Mac is connected to a display.
To change these preferences, choose Apple menu 
Option | Description | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Resolution | The amount of detail your display shows. Select “Default for display” to automatically use the best resolution for the display, or select Scaled to manually select a resolution. For instructions, see Change your Mac display’s resolution. | ||||||||||
Brightness | Controls how light or dark your screen appears. Move the slider to the right to make the screen brighter or to the left to make it darker. For instructions, see Change your Mac display’s brightness. | ||||||||||
Automatically adjust brightness or Ambient light compensation (depending on your display) | If your Mac has ambient light sensing, you can have the display brightness adjust automatically based on current ambient lighting conditions. | ||||||||||
True Tone | Automatically adjusts the colors on the display based on current ambient lighting conditions. | ||||||||||
Rotate or Rotation (depending on your display) | Rotates the image shown on your display by the chosen amount. For instructions, see Rotate the image on your Mac display. | ||||||||||
Refresh Rate | Adjusts how frequently your screen is redrawn. If the rate is too low, your screen may appear to flicker. If the rate is too high, the screen may be black because it doesn’t support that rate. Check the documentation that came with your display for the best rate. This option only appears if an external display that supports changing the refresh rate is connected to your Mac. | ||||||||||
Show displays in menu bar | Displays an icon in the menu bar that lets you switch between your most frequently used resolutions. This option only appears if more than one display is connected to your Mac. | ||||||||||
Overscan | If you’re using a TV as a display and you can’t see the menu bar, select this option. | ||||||||||
AirPlay Display | Use AirPlay to wirelessly show what’s on your Mac on another display. For example, you can use AirPlay to send video from your Mac to a TV or an iPad. | ||||||||||
Show mirroring options in the menu bar when available | Show devices available for AirPlay Mirroring in the menu bar. | ||||||||||
Gather Windows | Moves all open Displays preferences windows to the display where this button is. This button only appears if an external display is connected to your Mac. | ||||||||||
Detect Displays | Scans for all the displays connected to your Mac. Press and hold the Option key to make this button appear in the place of the Gather Windows button, then click Detect Displays if your Mac doesn’t recognize a display you’ve just connected. | ||||||||||
Tip: You can also use Control Center to adjust display brightness, manage screen mirroring, and access Display preferences. Click Control Center 
in the menu bar, then click Display or Screen Mirroring.