All of a sudden I’m unable to save any new files on my MacBook. What would cause this problem? I already have security setting to allow full disk access.
More information required. Like what error message do you get. What happened since the last time you could save files. Etc.
… updated to Big Sur, which LibreOffice version? Does: sudo xattr -d com.apple.quarantine /Applications/LibreOffice.app/ fix the issue (to be executed in Terminal)?