All of them can be selected, and then move the cursor to the starting point, will be moved to the origin of all over the place, but this approach often is not good; better approach is to set the origin to the start up.
The specific approach is: edit - origin --set The cursor becomes a cross edit mode, move the cursor to click at the start of the PCB, so. Pcb board starting point and the origin of it all at the beginning of the.