I did a fresh install of ubuntu 16.04, LO 5.1.2.2 works as expected but I can’t change the icon-theme, in the past it was possible to customize the views into small or bigger icons and(!) the style, is this normal? Can I change style anyway? If yes how?
Now I know what’s wrong, I had to enlarge/widen the menu. After that is the complete menu visible.
Case closed