public static void unregisterCustomDefaultsSource( File folder ) {
		if( customDefaultsSources == null )
			return;

		customDefaultsSources.remove( folder );
	}
Registers a folder where FlatLaf searches for properties files with custom UI defaults.
<p>
See {@link #registerCustomDefaultsSource(String)} for details.

@param folder a folder
flatlaf-core/src/main/java/com/formdev/flatlaf/FlatLaf.java