To print a single graph window, select the Print command from the File menu when that window is frontmost. 

For more complex printing, you should familiarize yourself with the workings of the  Layout Editor. This tool provides options for tiled printouts (e.g., 2 x 3 on a page), overlaid histograms, and any amount of annotation and elaboration you desire.  To print a large number of samples, process the layout into a stack, and print from the Stack Viewer.

You may print the contents of either the  workspace window. Select "Print" from the File menu. The printout will have the entire portion of the sample and analysis half of the window (the lower portion). All currently visible samples, analyses, and statistics nodes will appear in the printout.