There are many themes in NetBeans with black (or dark) background. But how can I do black backgroung in project-navigation panel

There are many themes in NetBeans with black (or dark) background. But how can
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It is not possible to do this with netbeans themes. You are using windows, so you can change the windows theme (for linux it would be the GTK theme) to achieve this. But this will reflect to other applications you are using.