Graphical Indicators:
The Hidden Active marker tells you that the currently active layer is hidden. To make the layer visible, just click on the marker.
The Mask Active marker tells you that the currently active layer's mask is currently being edited (instead of the layer's contents). To change back to editing the layer's contents, just click on the marker.
Drag Areas let you reshape selected vectors by dragging them. Square drag areas () let you resize a vector's bounds. Diamond drag areas (
) let you rotate a vector. Trapezoid drag areas (
) let you shear a vector. Circle drag areas (
) let you move the point of a vector. Small diamond drag areas (
) let you move the control points of a pen vector.