Can I inactivate a rule in an already published sandbox?

Yes, you can inactivate a rule in an already published sandbox if there's a problem with the rule or you don't require the rule anymore.

You need to do these tasks to revert the change.

1. Enable the sandbox.

2. Inactivate or delete the rule.

3. Republish the sandbox.

Alternatively, you can provide access to your administrator to test the rules, so you don't have to publish the sandbox.