Annotation tool strokes can be enabled/disabled with the checkbox in the panel header. It is a standard annotations panel where annotation layers and frames can be controlled. There is one difference in the behavior of the annotation tools from other areas -- when a new layer is created "on-demand" (when making a stroke without adding a layer before this) the default color for the layer is set to pink. This heightens the color contrast to make the stroke more noticeable on all kinds of movies.
Determines the data-block type the current annotation layer is stored.
Store the current annotation layer with the active Movie Clip data-block.
Store the current annotation layer with the active Track data-block.
The Annotate Tool for more information on general annotation layers.