Legacy Structural mode can be enabled using the configuration variable:
BB_STRUCTURAL_LEGACY_ENABLE = 1
This will load the legacy structural tools seen in earlier OpenBuildings versions.
This is made obvious to users by the Ribbon content for structural tools:
Legacy Mode can be enabled at the configuration level appropriate to the context:
Regardless of the use of this variable we still require the ProStructures content to be available in a configuration. The objective is to provide the enhanced ProStructures powered capability while maintaining legacy compatibility. By requiring the ProStructures resources to be available the option of enabling/disabling ProStructures capabilities via the BB_STRUCTURAL_LEGACY_ENABLE is possible.
Note that all of the PS_ variables are listed in the Configuration Variables dialog regardless of the state of BB_STRUCTURAL_LEGACY_ENABLE to support this.
ProStructures Interoperability - Configuration Changes