Font color does not show in Win10 compared to Win7 ultimate

I run LibreOffice on my Win 7 Pro Ultimate. I have installed LibreOffice latest version yesterday for a friend on her WIN 10 PC. But her “a” icon (underlined) icon does not show at all. Her bar shows and “a” with a small + on the bottom right side
When we right click there is an option in the fold down menu “font color” it brings in a paint bucket cursor
that after hours of trying we have not managed to color her fonts for a letterhead.
How to show and view the COLOR FONT icon thank you.
My friend is of age 70+ I want her to have the easy icon as myself how can I do that?

Pls test changing OpenGL on Menu/Tools/LibreOffice/View