Bar Label Attributes - 2D Rebar

Hello

Need some help concerning Bar Label Attributes specially with Text Attributes.

Every time we try to place a bar label the text doesn't show and we discover that this is due to the text height in Bar Label Attributes

is set to a very high value as shown in the following image.

Can anyone tell us where can we set a preset value lower than this default value or how can this height be related to the scale of the drawing.

Thank you in advance

Carlos Moura