On the Description elements tab of the Reinforcement description (bar symbol/with variable L) dialog, you can define parameters such as colors, line thickness, font size, and label shape for a description.
The options included in the Position field refer to a label and the number that the label contains (see the drawing below).
Specify label parameters:
Specify label number parameters:
Using the options under Description of leg length, you can define a description of the bar leg length:
The options under Description text appearance define a description placed directly behind a position: