How to tell if QTR is printing at 1440 DPI or 2880 DPI

I had an issue where all 3 of my Piezo printers were printing at 1440. I had solid areas that were grainy and small details like a window screen that were not sharp. I had heard that QTR can get stuck printing at a lower DPI than 2880 DPI. I followed Walkers instructions to remove all printers and reinstall and it worked, the details were back. But going forward I would like a way to test the DPI of the printer to see if I’m still printing at 2880 dpi using QTR. I’m on a Windows 10 PC if that matters. Thanks in advance.