Like you can see in the first pic, in instagram app amoled is working perfect but in the 2nd pic(samsung phone app) amoled is not working instead there is a grey like black colour.How to fix this issue?
No, here is the thingThis problem is not only in samsung phone app, almost every appLike settings, messages, phone, clock, calender every appExcept instagram and in the amoled wallpapers and videos.