How can I restore saved brightness levels on several monitors?

Create a macOS Shortcut containing a Set Brightness action for each display. Give each action its intended display and brightness value, then run the Shortcut whenever you want to restore that combination.

In Shortcuts, search for BetterDisplay and add Set Brightness. Repeat for the other displays, using an explicit display selection rather than a changing target such as the display under the pointer. Name the Shortcut for the setup, and optionally assign it a keyboard shortcut. BetterDisplay must be running with the required controllers available.

Keep Range includes software brightness upscaling consistent when choosing and restoring values. It is enabled by default. With it on, the action’s brightness range also includes software upscaling. A percentage does not specify a measured luminance and may look different on different monitors. Use Image Adjustment instead when you need to specify a particular supported brightness method or another adjustment.

If your displays use brightness synchronization, review those rules before testing the preset. Changing one display may also change the others. Confirm the final level on every monitor after the complete Shortcut runs. Use a separate Shortcut for each combination you want to recall.

A preset applies the values you choose. You can still change them later with the keyboard or other adjustments. For calibrated work, keep the controller, brightness range, monitor picture mode and automatic-brightness settings consistent with those used during calibration.

To include gamma, contrast or color-channel adjustments, add a separate Image Adjustment action for each value you want to restore, with an explicit display and adjustment type. The preset does not save an ICC profile or measure color accuracy. Review the image-adjustment actions for their supported values and methods.

See presets with Shortcuts for combining settings, macOS Shortcuts for action parameters and Synchronization Settings for interactions between displays.