Preview windows inside SHAPE are windows to show what an object in the scene creates as an output. This allows you to see the result of a Projector or an object set to output for example.
To add a new preview window navigate to View in the menu bar and select Preview. Preview windows can be adjusted in size and location just like other dockable windows. It can also be used as a popout window with the popout button in the top right corner, as well as closed with the close button in the top right corner.
The default behavior of the preview window is that it will show the output of the object currently selected. Selecting a different object will update the window to show the output of the newly selected object. Under the right click menu under the view option, it is possible to select an object to lock the object being previewed.
