How to change menu highlight colours

Is there any way of setting/changing the colours LibreOffice uses for the selected menu item as I’m currently seeing light grey on light grey - i.e. invisible
I’m running Libre Office under openSUSE 42.3 in KDE Plasma and I have tried setting the Options → View → Icon Style to every different option available but the menu items remain invisible when under the mouse cursor.
This also applies when working with the Styles and Formatting side menu where the current style is also invisible until actually clicked on.