Thanks for your help. Yes using a theme - Metallic Liquid. Changed the theme to Sandbeach to try it out and it did not make much of a change. So went to the default theme which with a white background and black text and all settings can be seen again. Similarly High_High_Contrast theme.
I guess black or dark background themes no longer work with the updates? Unless there is a way of changing the text color say to white?
You're very welcome @TheArchetect
Yes some of the existing themes are not playing nice with the new pie / Samsung One Ui update.
You could let the developer know via any contact methods in their theme or Samsung Theme area.