Overview & Background
After uploading 3D models to the BIM Viewer, users can select any object in the model. From there, users can hide, isolate, or view the properties of any model object. Being able to access model properties such as material, height, type, etc. gives your whole team actionable, location-specific insight into the model and project.
Select an Object
To select an object, left-click on it. The selected object turns Yellow:
If a user holds down the left-click for longer than 2 seconds, the viewer will transition to navigation mode.
View Properties
To view the properties of an object, right-click the object: 
Selecting 'Properties' will provide additional meta-data about the selected model object. Fieldwire will display every property included in your model for that object, which ultimately depends on the type of object, the platform in which you created your model, etc:
If you select 'Isolate' on the object, the viewer will zoom in on the specific object and hide all other objects. 
Conversely, selecting 'Hide' will hide only the selected object while displaying the rest of your model: 
'Show all' will show all hidden objects in the model. If a user right-clicks anywhere in the Fieldwire window but outside of the model, the only selectable option in the menu will be 'Show All': 
To deselect an object, click in the white space outside of the model.
Note: If you are zoomed in on a section of the model, you will first need to zoom out.
More Information
These articles shed more light on how to use the BIM Viewer: