In the new version of the Mendeley Reference Manager, the Desktop and Web versions of Mendeley are the same, with a dropdown menu along the top and your library Groups on the left. Note the Sync button at the top right;your library will automatically sync when you open it, but you can also click the sync icon to synchronize your Desktop & Web libraries whenever you wish.
Mendeley provides these tools to help you with your library.
File: Export All lets you export your library in 3 formats: BibTex, EndNote XML, RIS
Edit: Cut, Copy, Paste, Select All
Tools: Install Mendeley Web Importer, Install Mendeley Cite for Microsoft Word, Search for Articles Online
Help: Give Feedback, Get Support, Terms & Conditions, Privacy Policy, Reset Reference Manager
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The center pane displays your references. You can mark individual references as Read or Unread or Favorite by using the radio button & star icons to the left.
The right panel appears when you click on a reference.