Can I force the interface drop down menus to open in a box?

Using Libreoffice 6.1.3.2 in Ubuntu 18.10, when I click on some menus (Fomat, Insert, Edit) the corresponding menu drops down but overlays the titles of the menus on either side making it impossible to reach them.

See screenshot.Screenshot from 2019-01-10 18-38-33.png

In some distros (Zorin) the menu opens in box BENEATH the menu title with top and bottom arrows to navigate through the list.

Is there some kind of integration file missing?

Thx to anyone who can advise.