Page Width: sets the wideness of the whole page
Page Height: sets the tallness of the whole page
Header: sets the thickness of the header area at the top
Footer: sets the thickness of the footer area at the bottom
Margins: sets the border thickness between the frames and the outside edges of the page
Gutters: sets the thickness of the space between frames
Left Spine: sets an extra margin on the left for a spine
Right Spine: sets an extra margin on the right for a spine
#of Rows: remove or create rows of frames
Frames: sets the width of the frames relative to each other for each row
Resolution (DPI) sets the resolution of the final image:
Live Width: width from left edge of frames to right edge of frames "
Live Height: height from top of frames to bottom of frames (not including headers/footers) "
Page Area: total square inches "