Salesforce: Using Opposite Rule in Condition
To play well with conditions, you need to set both conditions for True and False situations. That said, if you want to do something on the basis of a true condition status, you also need to set a condition for the false case.
There is a new feature in FormTitan, the automatic generation of the opposite condition. You can use the said option as a checkbox saying "Support Opposite".
The checkbox is turned on by default and creates an opposite rule automatically. You have to turn it off in case of no use.
This tutorial about opposite rule in condition can help you read more information about setting up opposite rule.