Users can access the OpenBridge Modeler online product documentation by hitting F1 at any time. As detailed in the first figure below, the same link can be accessed in the top ribbon menu option at the Help in the Help Contents button. This will direct users to the webpage in the link below, where topics or keywords can search all the menu information.
OpenBridge Modeler Help (bentley.com)
Offline Help can be activated at File > User > Preferences from the Help Settings category, as shown in the screenshot below.
More beginners information for OpenBridge Modeler users can be found at the link below, for OpenBridge Designer Onboarding Guide, which also includes OBM: