Once enabled, the plugin will only affect outputs in the context of an article for the categories specified.

Categories Select the Joomla! standard categories the articles need to be from (multiple select) to be affected by the plugin.
Note Choosing none will disable the plugin on all categories but it will still affect articles using the plugin’s syntax.
Subcategories Automatically selects the next level or all levels of a category
Articles excluded The articles excluded from the selection (coma separated ids)
Articles included The articles added to the selection (coma separated ids)
Exclude if Full Image Will exclude any article that has a full image article already associated to it