turns out they added a big text box explaining the thing and offering you a redirect to the multi-column view, but they put it inside an element called ".navigation-panel__logo", which we hide on chaos.social because it used to contain just what it says – the Mastodon logo, which is annoying visual clutter to put on a website like that.
guess a box saying "switch to the view you originally wanted before we decided what's best for you" is part of the mastodon logo now, how fitting