Setting the cookies rweb_optin=off dnt=1 and then navigating to https://twitter.com/i/directory https://twitter.com/i/directory then your user profile via t

Setting the cookies rweb_optin=off dnt=1 and then navigating to https://twitter.com/i/directory https://twitter.com/i/directory then your user profile via the settings dropdown (next to [tweet]) seems to set you back to Legacy Twitter permanently without breaking your user agent.