Main Koru Toolbar

Koru toolbar helps you switch gizmo modes, undo or redo operations, select tools and toggle panels. Here is the left part of the toolbar:

Koru toolbar, left part

The left section controls the gizmo, then go the undo/redo buttons, the next section is for tools and the last button runs export. The right part of the toolbar is for toggling panels:

Koru toolbar, right part

You can read more about panels here.