If you want to print a single song, you will need to select that song from All Songs or a book. If you are in a set list, it will print the whole set list not just the single song.
When you export or email files, you are able to specify output options that effect just generating the exported files. To do this, open the Email or Export screens from the Share Menu and then locate the wrench in the lower right corner. Tap on ...
You will want to go into OnSong > Tap Songs > All Songs > Select a song > Share Menu > Print - in the bottom left hand corner is an icon that looks like multiple pages, tap this. It will switch over to a spreadsheet looking icon. In the preview ...
If you're looking to output a song list, go into the Share Menu by tapping on the square with the up arrow icon in the Menubar and choose Print. This will display the Print Preview Screen. In the lower left corner, tap on the Print Mode Button to ...