You cannot revert a DM update on Instagram once it has been rolled out to your account
Check whether Instagram lets you switch back by updating the app or logging out and back in
Clear the app cache on Android
Reinstall Instagram
Use an older device backup only if it restores an older app version
Turn off automatic app updates to avoid getting the latest DM changes again
Use Instagram on another device or web version if the feature differs there
Report the issue to Instagram through Settings and activity > Help > Report a problem