Save spreadsheet of frozen application

My spreadsheet I was working on has stopped responding and is completely frozen. How can I save my work before having to force quit. I am using a 2017 iMac running macOS catalina

I am using Neo office. This work is very important and I can’t loose the document.

[Edit - Opaque] Shortened title and put old title to details.

This Q&A is for LibreOffice, queries for Neo Office should go to https://www.neooffice.org/

If the office Suite has frozen then you are already too late. Always save early and save often.

If it has frozen then closing Neo then restarting Neo might start recovery, I don’t know for your suite. Don’t reboot before trying recovery