What is the "Group" shared folder?

Hi all. We embed Looker into our production application. Recently, I've noticed that when users interact with the secondary menu within the embed, there is now a "Group" folder. This folder was not visible in the past, and I'm not sure when it was made visible (presumably due to a recent update to the Looker platform). When I click on "Group", as a user of our production application, I'm able to view more of the content in Looker than I want the user to be able to view. I've provided a screenshot of our Looker embed that shows the secondary menu expanded and the "Group" folder circled in red. 

Is there a way to hide this folder? I do not want users of our embed to be able to access it.

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