MediaWiki:Visualeditor-dialog-media-type-section-help
From MoodleDocs
You can set how the media item appears on the page. This should be the thumbnail format to be consistent with other pages in almost all cases.
Note: You are currently viewing documentation for Moodle 3.1. Up-to-date documentation for the latest stable version of Moodle is probably available here: Visualeditor-dialog-media-type-section-help.