The bottom bar holds the action buttons you see while reading an email. You can choose which ones appear and in what order.
To configure them, go to Settings | Global Settings | Customize Menus | Configure Email Bottom Bar Actions.
Add, remove, or reorder actions using the drag handle. Any actions you've already chosen appear grayed out.
Available actions include: Delete, Archive, Read/Unread, Star/Unstar, Move, Block Sender (Mark Spam), Forward, Reply All, and Reply.
