A Microsoft file hosting and synchronization service.
Hey there, Dang NgocHoang Thanh
Welcome to the Microsoft Community forums.
Unfortunately there is no undo option when you select remove from shared list. However, when folk do share files with you, you get an email first. Then once you select the folder, it gets added to the shared list.
What I would recommend is going to your inbox and searching for any emails from your old account. Once they appear, you will see if you do, in fact, have an email from yourself from your personal account sharing the folder with you.
If you do, simply click onto it and view the file again. You will also notice there is a button at the top which says "Add to my OneDrive". This will save the contents of the folder to your OneDrive where you can access them, and it will sync to devices your signed into.
Hope this helps,
Regards,