HiTrần Thu Thảo,
Greetings!
Thank you for posting in Microsoft Community.
Based on the description you posted, it seems that you have an issue with MS Office wherein you want to know how you can adjust the view and how you can recover MS Loop deleted pages, on workspace.
Let’s work together in finding the best solution to this issue.
By the way, upon checking all of the available resources. We found out that the backup and restore feature that you are looking for. Is not yet available. That is why we highly suggest that you send a feedback about this matter.
In order for our developers to get notified and may apply your suggested options on the next upcoming updates.
Here's how:
During this preview we want to hear from you to help improve your experience – so send us your feedback in the app to help us shape the journey.
In the bottom right corner, select Help> Give feedback.

On Android or iOS, tap your profile picture at the top left to find Help and feedback.
Referenced link: Get started with Microsoft Loop - Microsoft Support
You may also check the following links that will provide you more information about Microsoft Loop app.
- Loop app Public Preview limits - Microsoft Support
- Get started with Microsoft Loop - Microsoft Support
- New Microsoft Loop app is built for co-creation | Microsoft 365 Blog
Hope this helps,
Sincerely
Khou Sun
Microsoft Community Moderator