The Move Down button is used with repeatable sections to move a row down. The move button must be added to the section you want to use it for.
Demo
Adding a Move Down Button
To learn how to add, edit, clone, move, resize, offset, or delete a move down button, please click here.
Field Settings
To edit the settings for this field type, click the settings icon on the field itself. Click the Save & Close or Save button to save your changes. If you do not want to save your changes, you can click the Cancel button or click any other form element to close the field settings sidebar.