Alternatively, you can select the tag in the publication edit area. When the tag is selected, the blue line of a tag frame changes to black dotted lines. When the tag name gets highlighted, the Properties pane displays.
Select the Icon type as appropriate based on the required tag Action. The available Icon types are: Default icon, No icon, Internal icon, External icon, Mail icon, Gallery icon, Video icon, HTML page icon, Publication icon, Bookmark icon, Search icon, and Table of contents icon.
The default icons are used by the Publisher.
Note: Customizing the icons is possible in order to change the default icons set as per the need.