A Bill is not paid until you pay it with a Bill Pay Check. I have to admit I have no visual of what the mac home page looks like or how different your options are than mine in regular desktop for PC but My options are File>Print Forms>Bill Payment Stubs which will allow me to print just the stub of bills paid by check. I also have a big yellow Print icon smack dab in the middle of the menu bar in each Bill, no clue why DT for mac lacks this simplest of procedures.
but here is a trick you can try as a last resort. Capture a screenshot
then open the file and print.