The upper right is set to always stay on top, which works well when you move the window buttons to the “MacOS” side of the window. Lower left is just my Status Tray. Upper left is Whisker Menu, Notifications, Audio Controls, and stacks open applications as icons. It takes up very little space. Oh and, for the upper right panel, clicking on the date opens Evolution in Calendar mode, clicking on the time opens it in Email mode.