Make a field required only sometimes

A field can be always required, never required, or conditionally required.

Conditional required

1. Select the field.
2. In its settings, set Required to Conditionally.
3. Add the conditions that make it required — same field → operator → value rows as show/hide logic, combined with ALL or ANY.
4. Save.

Example

On a leave request form, make Reason required only when Leave type is Unpaid or Other — routine paid leave doesn't need it, unusual leave does.

How it interacts with visibility

A field that is hidden by a show/hide rule is never enforced as required while it's hidden, regardless of its required setting.