Why doesn't the Error Message for a required field appear when the field is left empty?

Hello Experts,

We have set the Employee Comments field on the Evaluate Topic page as a required field. However, we have noticed that when the field is left empty, the expected error message indicating its required status does not appear.

Could someone knows as to why the Error Message does not appear when the required field is left empty and where could this error message can be customized?

The error message somewhat looks like this.

Thanks in advance.