There are many PDF files whose page sizes are not A4 or A3-This kind of the standard size. This causes a problem when importing PDF, which is that the pages added to the document are not the same size as the PDF pages imported. Therefore, I think the imported document should be zoomed when it is displayed. For example, when the page is turned vertically, all the pages should be displayed in the same width, and the standard size of the page should be selected when exporting Pdf.