In my case I'm using Linux Mint 19.2 Cinnamon. I have only this problem as soon as I enable the extension LanguageTool and try to insert a formula into writer. If I disable LanguageTool, then the problem is gone.
I filed the bug as https://bugs.documentfoundation.org/show_bug.cgi?id=128491 which might be a duplicate of this bug. Today I managed to duplicate the menu as much as I wanted (see attachment) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1825741 Title: [upstream] Multiple instances of global menu entries To manage notifications about this bug go to: https://bugs.launchpad.net/df-libreoffice/+bug/1825741/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
