Title templates are an advanced feature that allows form builders to control the text that is displayed in the responses tab. This text can be completely dynamic based on fields in the form response. This is also why the title in the response tab may be different to your form title.
For example, in the demonstration below we dynamically change the tile of the response based on the response fields to help differentiate it from other responses to the same form. For complex fields like SharePoint Datasources or dates, your can click the dynamic fields for additional configuration.