Clear All Labels button

Removes all current labels from the list in the Labelling panel and detaches from any labeled points.

Delete Selected Labels button

Removes selected labels only from the list in the Labelling panel and detaches from any labeled points.

List of labels

Displays the list of current labels. Labels which have not yet been assigned to points are shown in red; labels which have been assigned to points are shown in gray; and labels which have been assigned to points, but which are not present in the current frame, are shown in yellow. To edit a label name, double-click on the label in the list.