Linux distros include LibreOffice as the office suite. Creating a Writer document adds multiple blank pages by default as you proceed. Possibly somewhere in the 600+ pages of the Writer user guide there is a means to remove these pages, but the guide has no index.
Here’s a solution- since most non-Linux users cannot open a doc saved in native odt format anyway, you can save your doc as a pdf and easily remove those extra pages using OnlyOffice, just need to type character(s) on the blank page, or O/O will remove the last page of your doc.
When you save the doc as a pdf, the original odt doc is retained, so if you’re comfortable with L/O you can return to that doc for editing and additions.