Basically, when a scanned or image –based document is opened, a yellow bar will appear on the screen. It tells you if the current document contain editable text or not. Alternatively, the followings will help you to tell situation.
Use the Select Text tool which can be accessed by the shortcut key Alt+6 or under the HOME menu. Text will be selected by the Select Text tool.
Use the Text Viewer which can be accessed by the shortcut key Alt+9 or under the View menu. If there is editable text, text contents will be shown in the Text Viewer window, otherwise, it shows blank
