I understand how disappointing it is to lose the Copilot experience you enjoyed and found useful.
Currently, there is no documented option to switch back to the previous Copilot version. As this is a user-to-user support forum, moderators and community members cannot restore an earlier version or change Copilot’s features.
Please submit your request through the Send feedback option in Copilot or the Microsoft Feedback Portal. I recommend mentioning the specific features and experience you would like Microsoft to restore.
Thank you for sharing your feedback.