Rect: It is a toggle with the other three buttons, and when it is on, the base sequence of the strand corresponding to the feature is surrounded by a rectangle.
Area: Toggle with the other three buttons. When on, the background of both strands of the nucleotide sequence corresponding to the feature will be displayed in the fill color of the feature key.
All: Toggle with the other three buttons. When on, the base sequence of both strands and the background of the frame area are displayed with the fill color of the feature key.
