I want Azure Static Web App to use my own staticwebapp.config.json file.

I navigate to:
Static Web App->Settings/Configuration->General settings tab->Configuration file

And trying to set ‘checked’ to “Enable configuration file changes” checkbox.
I set ‘checked’, press Save button, reload page but checkbox is not checked.
So I cannot save field “Enable configuration file changes”.

Any browser the same issue.
What could be the issue?