Setting the center of the page is achieved through "Page Settings". The size of the center of 145mm × 125mm refers to the area of ??the printed graphics and text. You can subtract 145MM from the width of the paper you are using, and the remaining part is the sum of the left and right margins, subtract 125MM from the length of the paper, and the remaining part is the sum of the top and bottom margins. In this way, in "File" - "Page Setup" - "Margins", you can fill in the value you just obtained The page margin data. In this way, the size of the plate center is set.