When you go to the Print menu, "Print Current View" is in the dropdown menu under Copies.
The default text there is "Print All Pages"- click on that, and one of the options is "Print Current View".
There is not an option in Nitro to print grayscale- you would need to go to the printer properties link underneath the printer name, and select it from there. If your printer doesn't offer that option, then you're unfortunately not able to do grayscale printing.
Hope that helps a little.