Reporting to the last build (03Jul)
Loading Pencil will give you, as a default screen-shot, the pencil-tool as active (selected on the left Tools panel). Notice that ALL the Options on the OPTIONS-panel are ready to be selected.
Changing the pencil tool for another tool and coming back again to the pencil, will make PRESSURE and ALPHA selectable, the others grayed-out.
RESTART pencil in order to get the option CONTOURS selectable, otherwise it will stay that way.
(INVISIBLE may be operated again choosing the PEN tool)