The Folder Pane is shown below.

You can customize the view of the Folder Pane in the View > Folders menu. The order of folders can also be changed manually. To do this, click the name of the desired folder and move the folder up or down in the list while holding the left mouse button pressed.
Opening
–Main Menu > View > Layout > Folder Pane.
Elements
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button: Synchronize messages for the selected account with the server. The context menu of the button contains items:
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Get All New Messages: Download new messages for all accounts.
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Mail for <account-account>: Download new messages for the selected account.
–Create button: Create a new message.
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<account record>: Folders with messages saved on the server:
•Inbox: Received messages.
•Drafts: Saved drafts.
•Sent: Messages that have been sent.
•Archive: Messages placed in an archive. This folder appears when a user moves a message to the archive for the first time.
•Junk: Messages received and marked as junk.
•Trash: Messages deleted by the user.
•Custom and sub-folders: Folders created by the user.
•Shared folders: Folders of other users accessed through the web application.
–Local folders: Folders with messages saved on the device:
•Templates: Messages saved as a template.
•Trash: Messages deleted by the user when working offline.
•Outbox: Sent messages that could not be delivered to the recipient.