Back in May of 2021, users experienced an issue that caused the iOS and Android versions of Facebook to revert to its classic interface. Fortunately, this was a simple glitch that the Facebook developers resolved quickly. The solution was simple for users who experienced the problem: close or force close the Facebook application and re-open it. If, for some reason, your Facebook reverts to the classic white background, close the app and open it. Of course, you may also need to update the app in the App Store or Google Play Store if the problem persists.