On the Site Settings page, in the Web Designer Galleries section, click Site Content Types.
On the Site Content Types page, in the Show Group list box, select a group to view.
Select a content type and, if you are able, click the Source link. Otherwise, proceed to the next step.
Content types are arranged in groups to help users organize and browse similar content types. You can filter this list by using the Show Groups drop-down list.
Click the Site Content Type column for the content type that you want to browse.
Explore the associated columns and other settings for the content type you selected.
You might first need to click a value in the Source column when selecting a content type because that content type is defined in a parent site. Clicking the Source link takes you to the parent site that contains the content type. There you can directly inspect it.