Disable calculation groups without using tabular editor

fbittencourt , We have a version history on service ; we can revert to that. On service, file -> Version history. If that is available, revert to the old version 

Hi fbittencourt ,

Threre is a previous discussion in the forum related to the issue you are facing, multiple users have suggested various method to help resolve the issue
Solved: How to Re-Enable Implicit Measures Without Tabular... - Microsoft Fabric Community

Please check those replies and check if you can get your implicit measures back on.

I hope this information helps. Please do let us know if you have any further queries.
Thank you