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A condition shows or hides a field, or a whole section, as the person fills in the form. Hidden fields are never required.

Conditional fields: Laptop model shown only when Needs a laptop is ticked, and Team only once a department is chosen (1:23).

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Show a field when a box is ticked

Laptop model appears only when Needs a laptop is ticked.
1

Add the fields

Add a Checkbox with Field ID needsLaptop and Label Needs a laptop, then a Select with Field ID laptopModel, Label Laptop model and Required field ticked.
2

Add the condition

Click Laptop model. Under Conditional Rendering, click Add Show Condition, choose Form Field, Needs a laptop and Equals, type true and save.
The Conditional Rendering section of a field's properties with a Show when condition set to Form Field, Needs a laptop, Equals and the value true, and Add Show Condition and Add Hide Condition links.
3

Try it

Click Preview. Laptop model is hidden until the box is ticked.
A previewed form showing only an unticked Needs a laptop checkbox and a Submit button.
The same form with Needs a laptop ticked, now showing a required Laptop model dropdown and a Laptop delivery section, described Where should we send it?, with a Delivery address box.

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Show a whole section

Click the edit icon on a section’s title. Section Properties has the same Conditional Rendering and hides every field in the section; Laptop delivery above shows when Needs a laptop Equals true.
Section Properties for Laptop delivery: Title, Description Where should we send it?, Display Order 1, Collapsible section ticked, Collapsed by default unticked, and a Show when condition of Form Field, Needs a laptop, Equals, true.

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How conditions work

A field or section shows only when all its show conditions match, and hides when any hide condition matches. Hide wins. Client conditions need a form that knows the client; test them with Share Form > Impersonate.
  • Compare a Select, Radio or Multi Select by the option’s value, not its label: macbook-air-13, not MacBook Air 13.
  • For a Checkbox, use Equals true or Equals false. Keep true and false for Checkboxes: on other fields, Equals true matches any answer.
  • For a Multi Select, use Contains with one option’s value. Contains matches part of a value, so choose option values that don’t appear inside each other.

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What hidden fields send

A field that’s hidden and shown again keeps its answer. A template that names a missing field fails, so read optional answers in a Code step: ctx.params.laptopModel ?? ''. Option workflows (Dynamic options) still see every answer.

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FAQ

Check the value is the option’s value, not its label, and matches its capitals. For a Checkbox, use true.
The field was hidden, so it wasn’t submitted. Read it with ctx.params.laptopModel ?? '' in a Code step, or branch on needsLaptop first.
The form doesn’t know the client, or the variable name doesn’t match exactly. Client conditions are checked when the form opens, not as the person answers.
Hide it for the other answers instead, since any one hide condition hides it: Hide when Department Equals it, and Hide when Department Is Empty.
A condition was added without choosing a field or variable. Fill it in or remove it with its ×.
The condition points at a field that was deleted or given a new Field ID. Choose the field again.