I am using Ubuntu 16.04.6LTS, OpenGL 3.0 Mesa 18.0.5
I migrate from LibreOffice 5.1.6.2 with no issuses to 6.4.5.2 removing/purge previously 5.1.6.2
When I open a ODS/XLS or ODT/DOC files with double click on the file it come totaly transparent just the title windows is visible, in order to close I can use X icon on the windows or Alt-F → Exit Libreoffice, Options menus under file is visible, File and top menu option are not visible.
Libreoffice laucher take to long time to open a file in the recent files showed.
How can I fix it.