BY_SYMBOL_MAIN_VIEW (default) uses the orientation of the view that contains the section symbol. This only applies to section views that Tekla Structures creates automatically. Manually-created views have the same rotation as the view they are created from.
BY_MAIN_VIEW uses the same orientation as the main viewdrawing view that shows all parts in an assembly, cast unit, or single-part drawing from the selected viewing direction
Main view can be front view, top view, back view, or bottom view. The user can create several main views.
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).