In ServiceNow, UI Actions are elements that facilitate user interaction within the platform, enabling users to perform specific actions such as form submissions, record updates, or triggering workflows. The valid types of UI Actions include:

Form Button: A button displayed on a form that, when clicked, executes a defined action.

Form Context Menu: An option added to the context menu of a form, providing additional actions related to the form's record.

Form Link: A hyperlink on a form that directs users to another page or executes a script.

List Banner Button: A button displayed in the banner area of a list, allowing actions to be performed on multiple records simultaneously.

List Choice: An option added to the list context menu for individual records, enabling actions on a selected record.

List Link: A hyperlink in a list that directs users to another page or executes a script.

Record Navigation Button: Buttons that facilitate navigation between records, such as Next and Previous buttons.

Options like "Workflow action" and "Form choice" are not recognized as standard UI Action types in ServiceNow.

For comprehensive details, refer to the official ServiceNow documentation on UI Actions.