Calibre didn't modify any LibreOffice setting, nor did it modify any file that you didn't import into its library. It seems to me that this problem is unrelated to Calibre and only coincidently appeared at that moment. May I suggest that you ask for help on the LibreOffice support forum? (
https://ask.libreoffice.org/)
Quote:
I opened command prompt, c:\Windows and pasted in the recommended command.
"calibre-debug --default-programs=unregister". The space before the two hyphens before "default" is as I received the command. Systemy returns that it is not a command.
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Since you already uninstalled calibre, it is normal that this command does nothing.