People on mastodon.social, are you seeing the multicolumn ("advanced") interface by default, even if you didn't activate it?

Have had a couple of reports now of this happening, has mastodon.social made it the default by accident?

It used to be the default years ago, but since then the simpler single column interface was made the default. Multicolumn shouldn't be appearing by default.

#MastodonSocial