Each wallpaper design is created on a canvas taller than what's normally visible on the wall. The top part is the actual artwork — composed to be seen, and where the crop should stay by default. The part below is dead space: extra canvas with no real composition, only meant to be used when a wall needs covering all the way down — for example behind a bed frame, a sofa, or another piece of furniture.
Rule of thumb: leave the crop box where it starts unless the wall genuinely continues behind furniture. Pulling it down as a routine adjustment moves the print away from the artwork's intended framing.
Use Reset focus point at any time to snap back to the studio's intended default.