As HDR utilizes a wider range of brightness, this may mean you need to further collaborate the brightness setting for your HDR outputs. For more on how to use HDR is ProPresenter see: Using HDR in ProPresenter ]

You can do this from Screen Configuration. Select the screen outputting in the HDR Format and then navigate to the Color tab. Here you will see an option for HDR Max Brightness. As a default, the brightness will be set to 100%.

In order to collaborate your screens to be the correct brightness level, download and import this .probundle.

After import, trigger the slide to the output and view the output screen. Then open Screen Configuration and select your HDR screen that you are calibrating. Using the slider, reduce the HDR Max Brightness until both the white square and the ProPresenter logo are visible. Then slowly increase HDR Max Brightness until the ProPresenter logo is just barely visible.

This should make sure the brightness levels coming from ProPresenter are properly set.

If your image is still too dark or too bright, try adjusting the brightness levels on the output itself. If this is an monitor or TV, use the device settings. If the output is an LED wall, use the LED processor to make additional refinements.