This mode has the standard Model Browser window which can be used to navigate through the model in the traditional way by selecting rooms or surfaces. Alternately, use the Up and Down buttons on a selected space within the model viewport to change the level of decomposition.
First select the space either from the browser or graphically from the Viewport. Right-click on the space in the model browser to bring up the pop-up menu.
Drag the cursor over the menu to highlight the option required.
