For those who are stuck in the similar problem, here the self rescue solution, it work for me, all my atals view back to function .... by downgrade, roll back previous version before they take out the feature. A lesson learn as well, already prefect function take out ... to induce migration to other platform / alternative product, maybe.
1. I Use Mac, so uninstall the current version, complete purge out the database. Then reinstall 6.11.x and it work back.
2. I Use iOS, uninstall the current version, then reinstall back v7.7.11 and it work back. Do the same way for my iPad and it work back.
3. I Use Android, uninstall the current version, then reinstall back v7-9-4 and it work back.