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Make sure that all the modules were installed. The best is to install from the packages downloaded through the official page (link bottom right of this page).
Please add
[Solved] at the beginning of the title in your
first post (top of the topic) with the
edit button if your issue has been fixed.
LibreOffice 7.0.3 on Xubuntu 20.10 and LibreOffice 6.4.6 (portable) on Windows 10.