YouTube is eagerly promoting its Shorts feature as much as it can. Enabling this option will remove Shorts wherever they appear.

Removes video thumbnails. Rid the site of exaggerated facial expressions and clickbaity images.

This option attempts to remove every UI element that isn't related to searching for videos and watching videos. The homepage becomes a single search bar. Search results will have thumbnails hidden. And the video player will only show the video and its description, nothing else.