The tool selector is the Tool Menu button and the 5 quick selection tools, of the last five tools you used.
The LayerView Toggle toggles the LayerView at the side.
Toggles Fullscreen Mode.
The system menu: Share/Save, Load, Clear, About, Exit.
For additional information on Share/Save, and Load: See Files
The layerview allows for a viewable and manipulations of the various layers.
Located in the bottom right, the undo and redo buttons remove and restore changes to the embroidery. This is limited to 25.
Located in the bottom left, the color selector changes the colors for the currently selected layers.