Hullo,

Some menus in setting windows shows the white item text on white background. They are only visible by moving hover blue rectangle on them.
I use OpenSuse Leao 42.1 KDE Plasma 5.x MX Them with Breeze Dark colour setting (Window Decoration?)

All other visual aspect seem to appear great.

Any helpful advice will be deeply appreciated. Thank you in advance.

Bump. Doesn't appear to be a work-around that I can find. I'd like to see some way to manually configure these colours if the theme itself is buggy, although maybe the theme is not to blame here, IDK.

Have you tried going to the Colors tab of the Colors settings group? It offers the option to fine-tune specific colors in the theme, so if the theme is at fault, that should fix it.