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Setting the policy sets the resolution and scale factor for each display. External display settings apply to connected displays. (The policy doesn't apply if a display doesn't support the specified resolution or scale.)
Setting external_use_native to True means the policy ignores external_width and external_height and sets external displays to their native resolution. Setting external_use_native to False or leaving it and external_width or external_height unset means the policy doesn't affect external displays.
Setting the recommended flag to True lets users change resolution and scale factor of any display through the settings page, but their settings change back at the next reboot. Setting the recommended flag to False or leaving it unset means users can't change the display settings.
Note: Set external_width and external_height in pixels and external_scale_percentage and internal_scale_percentage in percents.