Hi Martin,
It's great to see that you're enjoying P3Dv5.3 and looking for ways to enhance your immersive experience on your impressive 210-degree screen setup. I understand your concern with the oversized stars and would be happy to help you find a solution.
You can adjust the star size by editing the Prepar3D.cfg configuration file, which can typically be found in the following location:
%APPDATA%\Lockheed Martin\Prepar3D v5
Before making any changes, it's always a good idea to make a backup of the original .cfg file in case you need to revert to the default settings.
To resize the stars, you will want to locate the STAR_SCALE entry under the [SCENERY] section of the Prepar3D.cfg file. If it's not already there, you can simply add it yourself. This entry controls the size of the stars rendered in the simulator, with the default value being 1.0. To achieve the desired 1-pixel size, you may need to experiment with smaller values. For example:
[SCENERY]
STAR_SCALE=0.1
You can start by setting the value to 0.1 and adjust it accordingly, depending on the results you get. The lower the value, the smaller the stars will appear in your simulation. You might need to try a few different values to find the optimal one for your specific setup.
After making changes to the Prepar3D.cfg file, save it and restart your simulator for the changes to take effect. Remember to keep a backup of your original configuration file so you can easily revert to the default settings if needed.
I hope this helps, and I wish you clear skies and enjoyable flights on your impressive setup!