Closed subjet and font color change

Hello and thank you for your plugin … ??
I have a question about a setting, when I close a subject, the font color changes in the text of the subject in question, and I can not find where it comes from …
There is in the tab “Subject / response display” a part “Subject closed-Content” but it concerns only the background of certain parts, not the color of the font …
Can anyone help me ?
Thanks in advance,
cordially