Which steps are necessary to enable type-ahead functionality for an input field on a screen?

Enabling type-ahead functionality for an input field primarily involves activating the proposal search feature, which is designed to enhance user input experiences by suggesting possible values as the user types. This immediate feedback helps users select appropriate entries quickly and improves overall efficiency.

When proposal search is enabled, it allows the application to display a list of suggestions based on user input, significantly aiding in data entry. This capability is crucial in contexts where users commonly input repetitive or predefined data sets.

While checking prerequisites and identifying elementary search help are important steps in setting up search features more broadly, they do not directly initiate type-ahead functionality. Furthermore, processing on all input fields is more about applying changes universally rather than specifically enabling the type-ahead feature for an individual field. Therefore, switching on proposal search stands as the primary action required for enabling this specific functionality in an input field.