Customizing RadPrintSettingsDialog ToolCommandBar

Hello, George,   

I suppose that you mean the command bar in the RadPrintPreviewDialog:

Similar to the other dialogs, RadPrintPreviewDialog is a derivative of RadForm. You can access all of its controls via the Controls collection. However, the RadPrintPreviewDialog.ToolCommandBar property gives you direct access to the RadCommandBar that is used.

As a RadCommandBar, ToolCommandBar is arranged in rows, strip elements and items to each strip element:
https://docs.telerik.com/devtools/winforms/controls/commandbar/structure#radcommandbar

You can find below a sample code snippet demonstrating how to hide the print settings button: 

            RadPrintDocument doc = new RadPrintDocument();
            doc.AssociatedObject = new RadGridView();
            RadPrintPreviewDialog dialog = new RadPrintPreviewDialog();
            dialog.ToolCommandBar.Rows[0].Strips[0].Items[1].Visibility = ElementVisibility.Collapsed;
            dialog.Document = doc;
            dialog.ShowDialog();

Thus, you can access every button you want and manage its visibility.

I hope this information helps.

Regards,
Dess | Tech Support Engineer, Sr.
Progress Telerik