Details Area
The right area is the Details Area, and it shows details for the element that is currently selected in Model Viewer (if any), or for the cube (if nothing is selected).
For example:
To hide this area, click the Hide Details button 
. If you do so, the Model Viewer is widened.
Then, to display this area again, click the Show Details button 
.
In this area, you primarily work on the Details tab.
