The Stacked layout arranges radio button options vertically, with each choice on its own line. This configuration provides the maximum available horizontal space for each label, making it the ideal choice for long text descriptions, such as a list of pizza toppings, to ensure they are fully visible and not truncated. The Stacked layout is the default and recommended option when label length is a concern.

A. Compact: This layout displays options horizontally. It is designed for short labels and will truncate longer text to fit the options on a single line.

B. Grid: This layout arranges choices in a grid format. While useful for organizing many options, the fixed width of the grid cells can cause long labels to be truncated.

1. Appian Documentation, a!radioButtonField() Component:

Reference: Under the "Parameters" section for the layout parameter, the documentation specifies the behavior of each option.

Details: It states that STACKED "Displays choices vertically. This is the default value. Use this layout when the labels are long." Conversely, it describes COMPACT as suitable "when the labels are short" and GRID for when "you have many choices with short labels," both of which imply a risk of truncation for long text. (Appian 23.4 Documentation, SAIL Design > Components > Inputs > Radio Button)

2. Appian UX Design Guide, "Radio Buttons" Pattern:

Reference: The guide on selection patterns provides best practices for using input components.

Details: It recommends using the vertical (Stacked) layout for radio buttons when clarity and readability of the labels are paramount, especially if the labels exceed one or two words. This aligns with the requirement to prevent truncation for a list of toppings. (Appian 23.4 Documentation, SAIL Design > Design Patterns > Selection)