Category in Advanced options dialog box: Analysis and design
Use this advanced option to define the diameter of the analysis parts when the analysis parts are shown in model views. Enter the value in millimeters. The default value is 70 mm.
This advanced option is user specific and the setting is saved in options.bin under the user folder, for example, in C:\Users\<user>\AppData\Local\Trimble\Tekla Structures\<version>\UserSettings. Redraw the model views after changing the value to activate the new setting.