The items that can be hidden are: Explore, Subscriptions, Subscriptions list, Library, History, Your videos, Watch later, More from Youtube. Adds a list of check-boxes to the bottom-most of the left sidebar for toggling visibility.
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Another script that may interest you is one that hides Youtube recommendations on homepage (https://greasyfork.org/en/scripts/429490-hide-youtube-homepage-recommendations-and-tags)
