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Double menu bar in LibreOffice

I use LibreOffice under Ubuntu 18.04 64 bits.
Since I installed Language Tool 4.7, when I preview a doc in Writer, the menu bar is double and still remains in double (even after preview).
When I uninstall Language Tool 4.7, all becomes normal.
So, what ?..
I didn’t try under Windows, and with another version of LibreOffice.

According to this page, it will be fixed in LibreOffice 6.3.3.