Operating System is Windows 10, on Acer desktop
I can assume you save your documents in the “Documents” file or on your Desktop or a different file besides your Libre Office file? If so you will not lose any documents when you uninstall/reinstall.
All your docs should be retained between uninstall/reinstall events.
You do keep your docs in a separate directory, right ?
BUT you will back up all your docs just in case of any unintended consequences.
HTH
(Thanks for marking my answer as correct, and boosting my karma.)