These styles are imported from your current theme editor-style.css file. However some themes do not have this functionality. For these themes TinyMCE Advanced has the option to let you add a customized editor-style.css and import it into the editor.

No styles are imported in the Formats sub-menu.
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WordPressThese styles are imported from your current theme editor-style.css file. However some themes do not have this functionality. For these themes TinyMCE Advanced has the option to let you add a customized editor-style.css and import it into the editor.Wordpress Plugins, Themes, Tutorials, Snippets, How-to