In apex 5.1.1, window.print (ctrl-p) does not print charts as they appear on the page. Try going to the pie chart page of the charts application and ctrl-p (in chrome). The screen print below is what I see with ctrl-p from single region display mode.
Has anyone any insights on how to encourage windows.print to print what is on the page. What should I include/exclude from my pages so window.print works OK.

This is what I am trying to print:

Interestingly, the other charts down the page render reasonably well, To the point that changing from portrait to landscape in print preview of the master/detail charts render side-by-side in landscape and one above the other in portrait.
~t