When you open a new tab with a collection, that tab is dedicated to the selected collection. It provides all the tools and actions you may need to perform on a collection.
At the top left, you'll find your current location: Connection -> Database -> Collection. Next to it, the pills represent views / features / tools to work with the collection:
Mingo lets you copy your collection into a different database or new collection very easily with just a few clicks. This will take you to Mingo's Dump tool and preset your selection. Just submit your action and Mingo will perform the copying.
Basically the same functionality as with Copy collection to, but dumps the collection into a directory or archive file. This action opens the same Dump tool, but with different settings.
This option focuses the Export view in the collection tab. The details of how to export documents are described in the Export section of the docs.
This action opens the View generator form in a modal window. Creating views requires a basic knowledge of how they work, so refer to the MongoDB documentation, please.
This does what it says and it's very simple. Just provide the new collection name.
Truncating a collection means deleting all its documents completely, essentially making it empty. All associated Views and Indexes are kept. So use this feature wisely. There's NO UNDO for this action.
Dropping a collection means deleting all its documents and the collection itself, completely. Views and Indexes are deleted, too. So use this feature wisely. There's NO UNDO for this action.