cookies => PREF => f1=50000000&f6=43418  copy: &f6=43418 or &f6=8  *after cleaning cookies new layout comes back, if you want to keep it do not delete cookies.  (F12 / ctrl+shift+i / ctrl+shift+c) - or right click anywhere and INSPECT YT THEME:  https://userstyles.org/styles/123887/youtube-better-full-dark-theme-2018-arc

Autoplay Policy Changes chrome://flags/ # autoplay -policy => no gesture chrome://flags/ # enable -experimental-web-platform-features => enable for more information:  https://developers.google.com/web/updates/2017/09/autoplay-policy-changes#iframe

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