You can print a Writer document as a brochure or a booklet. That is, Writer prints two pages on each side of the paper, so that when you fold the paper, you can read the document as a book.
When you create a document that you want to print as a brochure, use portrait orientation for the pages. Writer applies the brochure layout when you print the document.
LibreOffice is not designed to handle brochure printing of documents that include landscape page orientations, but it is possible to print such documents.
It is not possible to print a large image across two pages. Cut the image into two parts, and insert each part on different pages.
Choose File - Print.
In the Print dialogue, click Properties.
In the properties dialogue for your printer, set the paper orientation to landscape.
If your printer prints duplex, and because brochures always print in landscape mode, you should use the "duplex - short edge" setting in your printer setup dialogue.
Return to Print dialog.
In the Page Layout section, select Brochure.
For a printer that automatically prints on both sides of a page, specify in the Range and Copies section to include Odd and Even Pages.
If LibreOffice prints the pages in the wrong order, select Print in reverse order in the Range and Copies section, and then print the document again.