This tool edits the content as it was originally created within the PDF. By default this mode will select and edit all available content types within the PDF. If you wish to edit only a specific content type (for example: images only) you can change the mode by clicking on the down arrow and changing to a specific mode.
All: Edits all of the available content types at once. (Default)
Text: Edit individual text strings with the PDF
Images: Edit images contained within the PDF
Paths: Edit lines and shapes within the PDF
Shades: Edit shade and gradient objects within the PDF