XS_MAX_AUTOMATIC_RADIUS_DIMENSION
Category in Advanced options dialog: Dimensioning - parts
Use this advanced option to define the maximum radius for adding automatic radius dimensions in single part drawings. The default value is 5000, which means that only dimensions less than 5000 mm will be created automatically. Tekla Structures will display radii smaller than the value you enter in drawings.
This advanced option is model specific and the setting is saved in the options database.