There are two ways to select several objects over the model. The first one is through the range selection mode, that selects objects which the boundaries intercepts with the selection rectangle manually drawn by the user. By default the range selection is activated by holding the
Shift key and dragging the over the canvas area. In order to allow the visible rectangle to select objects just release the
Shift and the mouse button. It is possible to change the activation mode of this feature on general settings.
The second way to select a set of objects is through the schema object. In this form you can right clicking the schema rectangle on canvas area or a schema item on model objects widget and select the
Select children action causing all graphical objects under the same schema to be selected.