In a tweet, Instagram's head of product Adam Mosseri said: "Sorry about that, this was supposed to be a very small test but we went broader than we anticipated".
The change was reversed and everything went back to normal for Instagrammers.
Instagram has improved for the better a number of times. The horizontal feed seemingly only affected the main feed while it was active, as user profiles still used the standard scrolling feed.
Instead of scrolling up endlessly and seeing images from the accounts that you follow, users were encouraged to tap or swipe right or left to proceed through the feed (much like they do in Instagram Stories).
Some wondered if it was a way to stop people just scrolling endlessly through updates by making them tap and examine posts before moving on.
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Some were saying the change was big enough that it was ruining their favorite app.
Given the extremely negative response that the updated received from its users, Instagram may think twice about releasing the update to the public.
As users of the app realized the change this morning, many took to Twitter to express their unhappiness. The old design was still available through Instagram.com, however, allowing you to scroll up and down, in addition to the Explore page on the app.
Android users can go back to an earlier version of the app, but it takes quite a few steps and can be hard for non-tech savvy users.
Instagram did not immediately respond to Newsweek's request for comment.