My s6 edge has changed it's contacts list to white text on a white background which makes my contact details al.ost unreadable, any ideas as to how to rectify much appreciated thanks
It sounds like you may need to change your theme.
Settings>then type "theme" into the search bar on top>Select Wallpaper and Themes>Select Themes and choose a new one - you can touch the 3 dots in the top corner to search, I prefer Material Dark, but ymmv.
Good luck!