XS_MARK_LINE_SPACE_FACTOR
Category in Advanced options dialog: Marking - general
By default, Tekla Structures leaves a space of 0.3*text height between the lines in multi-line marks, for example, part, bolt, and connection marks. Use this advanced option to change the default value. This advanced option also affects the space between the lines in multi-line text objects.
This advanced option is model specific and the setting is saved in the options database.
In the example below, the value was changed from 0.3 to 1.