I love my S20 automatically changing to Landscape mode.
Usually I only use Landscape mode for use with the camera and to watch videos.
However, I soon found it annoying when my home screen and Internet pages would change to Landscape mode too.
Therfore, I turned automatic Landscape off.
I was fully prepared to change it on an as and when needed basis.
Imagine my surprise when I noticed a small rotating phone icon appear bottom right when I was about to watch a video.
I tapped the icon to discover it is a quick way of rotating that particular screen.
Well done Samsung!