SO I had the theory that the online mite be the problem here , do to that I get kick from online mod immediately when my fps drops below 60 in the main menu , and they have put up the black bars on 21:9 screen setting so everyone can play at 60fps all the time so no one experience lag?
I am going to admit I am not the best att computers , but I tried out this by starting steam in offline mod and then launching Dark souls 3
When I was going to load my save the loading took much longer time than normal and when it finished , I had full screen

Unfortunately when I turn off my game and tried the same thing aggen the bars were back , so mabby thes have nothing to do with it , but it mite be a suggestion to people to try and play in offline and se if it happens for you too.
[Dyslexia non english sorry]