Hello Antnee,

You can change the background color of "Outside of regions" to a different color. To do that, please go to the Display tab of configuration properties, and select "Outside of regions" in the "Specify Part" list box, and then select a background color.

Please let me know if you have further questions or comments.
Thank you,

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Yutaka Emura
Developer of EmEditor
http://www.emeditor.com/