The brass outline is your mat. Tap anywhere on the pattern to bring that area onto the mat.
Your current project will be gone from this device, with its marked pieces, lines and cut ticks.
The screen changed size, so the grid may no longer match your mat and the pattern may not be true size.
Mark each piece once, on the whole sheet. Then you can project them one at a time and tick them off as you cut.
For print-at-home patterns on A4: lay the pages out in rows and columns and slide them together into one sheet you can trace.