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 is model specific and the setting is saved in the options databasedatabase file that contains the settings of model-specific general settings and advanced options
There are two options databases, the model options database (options_model.db) and the drawing options database (options_drawings.db).
In the example below, the value was changed from 0.3 to 1.