This is standard application menu bar.
The navigator controls the workspace view scrolling/zooming/rotation.
The layer panel controls each layer settings.
The color panel provide drawing color selection in many ways.
The tool panel shows tool listings and settings.
The quick bar provide some useful buttons as shortcut.
In this panel, you can quickly access undo/redo, selection manipulation, workspace zooming/rotation/flipping, and stabilizer settings.
The workspace view shows current working canvas.
The view bar controls each view selection.
The status bar reports some useful informations in current status.