In custom tools developed in the Forms tool, you can set any field
you have placed on a form as a required field. If you set a field as
"Required", users are prompted to supply a value for the field, if
missing, when they save the record. In custom tools developed in the
InfoPath Forms tool, this task is done in Microsoft InfoPath.
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Select the field in the form layout.
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Select
Required from the
More Properties drop-down menu:
