The bug led to a small test being distributed widely, the company said.
And another user said: "Not to be dramatic but this new instagram update is the worst thing that's ever happened in 2018".
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To say that the reaction from affected Instagram users was one of shock and horror would be an understatement, even though the horizontal scrolling affected only the main feed. The new way of navigating the app mirrored the way users move through the popular "stories" feature. "I'm not trying to swipe photos @instagram can I have the old layout back?" tweeted user @j_mallari.
A number of us at Engadget have the new feed orientation as well, though for some people, the new feature hasn't yet reached all of their accounts. "Should already be rolled back". In that section of the app, it made a certain amount of sense - after all, you are just poking around, checking out random posts from strangers anyway.
Today, Instagram took to Twitter to apologize after reversing the update.
The change, apparently rolled out by mistake, switched to a sideways-scrolling format activated by tapping to the left or right of the screen, according to the network. In effect, the entire feed turned into a Story, with tap controls as well as a progress bar up top.