The Schema plugin won’t display any front-end output, so nothing is visual to users.
You can do a test for your posts and pages in Google Structured Data Testing Tool,
For site, you need to fill the fields in the plugin settings, under the Knowledge Graph and Search Results tabs. So, when you do the test for the home page, you should see that Google can find the markup.
For content, you should see markups as the following:
– Article : for post type “page”, this is your site pages.
– BlogPosting: for post type “post”, this is your normal blog posts.
I hope this is help!
P.S. There is a plugin screenshot to show you the Structured Data test. Also, I just created a dedicated website for Schema plugin yesterday so I can extend plugin documentation, so it will be updated as soon as I can with everything about the plugin, how to use it, override its output, and more.