Grease Pencil Tool options

Opens the Grease Pencil Tool, letting you draw on the scene view with virtual marker. See also Draw on the scene view with Grease Pencil.

Auto Create Frames
If on, lets you draw on the current frame once you open the Grease Pencil tool.

Auto Create Frames is on by default. If you turn this option off, you must click in the Grease Pencil tools so you can draw on a frame.