The form field is not highlighted in red "Required" even though I added it to the FORM_FIELD_REQUIRED

Process Design Form Designer
1

Cause

This is usually caused by the form field ID does not exactly match the value of the FORM_FIELD_REQUIRED text.

Solution

Check the spelling of the field ID entered in the FORM_FIELD_REQUIRED text value. This ID is case sensitive as well and must match the case of the form field ID.

2

If the section is on readonly with a condition (like "CurrentWorkflowAction != “ACTION_NAME”), there are the problem too.

Solution :
If you want to use readonly condition, you need to check “Required” directly on the field and not on the “Behavior” panel