All of a sudden today I realized that when watching YouTube videos in landscape mode, tapping the "crop to fit button" no longer did anything. I tried numerous videos and they all did the same thing. After reading a thread about the problem on XDA, the workaround was to go to the App setting for YouTube and uninstall the updates. Now the button works and the videos enlarge to fill the screen. Sooner or later the developers for YouTube (Google) and other apps will get their act together, but for now that's the solution.
Their is a thread about the problem on XDA where I found the solution:
https://forum.xda-developers.com/galaxy-s8/help/stretch-to-fit-screen-option-t3594623
Their is a thread about the problem on XDA where I found the solution:
https://forum.xda-developers.com/galaxy-s8/help/stretch-to-fit-screen-option-t3594623