You have found it. I knew nothing of lasers or design when I wandered in here and it was this community that damaged my ignorance.
The QR code on proofgrade is really just for the beginner’s benefit. The upper left of the user interface has a search box, just start typing in the material and the choices are presented. As your experience grows you will rely on them less and less, and begin to formulate and save settings for a particular material/effect.
If you printed “the gift of good measure” and it didn’t cut through support will ask for pictures of the front and back to judge the operation of your machine. That file has engraving, scoring and cutting, so they can see all aspects of the machine’s behavior. You would want to post those pictures along with a description of what you have tried in “Problems and Support” where a post there opens a support ticket.
To answer your question, with the material recognized the settings are auto-populated and you shouldn’t have to do multiple passes to cut through. After cutting, without allowing the work to move, you can use a piece of tape to see if the cut lifts out. If not, you could then do a second pass just to avoid wasting material.
Make that post in P&S, and support will get with you and evaluate your machine.