Supported
Supported items are generated automatically or handled directly by the guided workflow. Examples include standard text fields, dates, checkboxes, simple dropdowns, primary SharePoint binding, and simple view navigation.
Builder review
Builder review items usually have a useful scaffold but need inspection in Power Apps Studio. Examples include show/hide sections, complex visibility, secondary-list dropdowns, repeating data, people fields, and imported media layout.
Manual rebuild
Manual rebuild items are detected so they are not invisible, but they are not converted automatically. Examples include custom code, script events, ActiveX/custom controls, deep nested repeating groups, and logic that depends on external systems not represented in SharePoint metadata.