Where can I find an explanation for the custom dialog boxes in the single image export menu? I'm trying to align different parts of an SVG image for a laser cutter and the export shifts the parts to 0,0.

Hello Jim

Can you share a file presenting the problem and describe your needs in more detail?

• Left and top refers to the upper left corner of exported area.
• Left=0 and Top=0 refers to the upper left corner of the page and, provided the units you use in export dialog are the same as thoses displayed on rulers (you can right clic on rulers to switch between units), you can read on rulers the coordinates of cursor (or use exact coordinates, displayed bottom right of screen : the unit used there is the unit displayed by rulers).
• In export dialog, you can use Right and bottom to set the coordinates of lower right corner (self explanatory) or use width and height to set the size of the area to be exported (from left corner).

But you probably already guessed all that.