How Can I Print The Tiled Pages Separately As A4 Sized Papers?

There are 12 boxes as you see. I want to print them separately as A4 papers with my Printer.

How can I do this?

If each rectangle is intended to be printed on a A4 page, I think it would be better to use page tool to create 12 pages, and at the end of the process, use export panel to export the 12 pages in pdf. To me, it is wiser to use a pdf export to print your work, as inkscape is known to have issues with direct printing.

Note that each rectangle as proportions different from A4 proportions.

How to use page tool to do this? Can you tell me the steps please?

https://wiki.inkscape.org/wiki/Release_notes/1.3#Page_Tool