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All visual components in Reportal have a "hide" expression. If this expression evaluates to true for a component, then this component is hidden from the report viewer. Additionally some components have "render" scripts used to dynamically modify the properties for the component before the component is rendered/displayed.
Note that you can use the CTRL+S keyboard shortcut to save changes when writing component scripts.
Component Hide Scripts
Used to dynamically hide or show visual components on a report page depending on various criteria.