FormLayout

JSON-safe FormLayout props forwarded to Astryx.

Supported Astryx props include:

• direction ('vertical' or 'horizontal' or 'horizontal-labels'): Controls field arrangement. Vertical stacks top-to-bottom, horizontal arranges left-to-right with equal flex-grow, and horizontal-labels uses CSS Grid with labels to the left of inputs (collapses to vertical on narrow viewports <=480px).
• children (ReactNode): Form fields to arrange. Accepts Astryx inputs (TextInput, Selector, etc.) and Field-wrapped custom controls.
• xstyle (StyleXStyles): StyleX styles for layout customization (margins, positioning, sizing). Must be a stylex.create() value, not an inline style object like style={{}}.

Props typed as React nodes, render functions, event handlers, refs, or StyleX styles are documented for Astryx parity but cannot be serialized directly from Python unless the wrapper adapts them.

See Astryx component docs: https://astryx.atmeta.com/components/FormLayout.