0 = off. If your prints sit off-center, shift the PDF the opposite way: prints landing too far right need a negative Right value, and prints landing too low need a negative Down value (negative Down moves the page up). Applies to the downloaded PDF only — the screen does not change.
Click a frame to add a photo and drag it to pan. The dashed area is reserved for your greeting. In Custom mode, shift-click selects several photos.