Page layout disrupted when making a PDF

I have completed my novel in LibreOffice 6.3.6. I need to make a PDF to submit it to Amazon Kindle paperback. I select my Libre document and click on Make PDF. In the result I’ve lost my mirror pages and the right margin has enlarged so much that it is useless. What am I doing wrong and how can I fix it.

Try File/Export PDF from within LO

Thank you AdmFubar. Your suggestion worked perfectly. I now have a PDF of my novel ready to submit. I am extremely grateful

LibreOffice has a built-in function to create PDF files.

As @AdmFubar writes in his comment, you can select the menu

File>Export as>Export as PDF... in LibreOffice in the opened file.

In the following dialog box “PDF Options” in the tab “General” you might want to check the box "Hybrid PDF.

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With me Windows 10 Home; Version 2004; 64-Bit | LibreOffice, Version: 7.0.0.2 (x64).