absolute most goated ui tweaks addon for youtube. this + sponsorblock + ublock origin and you're set. the menu is splendidly organized and is very easy to use. you can customize almost every ui element. there's also hotkey support!! the themes are a nice bonus and they all look great.

i use it to:
1. hide shorts from everything except my subscriptions
2. redirect youtube homepage to subscriptions feed
3. make search results appear in a grid
4. hide all the clutter (explore, shorts, etc) from the sidebar

+ some other misc tweaks but those are the main ones.

i've used many other types of addons like this for years but i will probably stick with this one. excellent all in one solution, kudos to the developer!