“All Site Stories” lost the second column

Starting from a few days ago, when you click on “all site stories” you no longer get a second column of stories, you get one big story. This makes it hard to manage.

Is this intentional?

You’re probably in the Full view instead of Split view. It’s in the bottom right-hand side of the story titles list.

You are correct, thank you.

Was there some default change? Did I accidentally hit a keyboard shortcut? Sigh.