This question already has an answer here:

A couple minutes ago, the website turned into a old version of SO (Back to the future).

enter image description here

Even if I switch to the normal design (via button 'Time travel!'), the next post of SO will still have the '90s design.

How can I turn it off permanently?

marked as duplicate by Mari-Lou A, Glorfindel support Mar 31 at 10:20

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • @Mari-LouA I searched only for "back to the future" - did not thought of "time travel". Thanks, it is a duplicate! – alexander Mar 31 at 10:20