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In the latest version of ARIS Express, we also improved the behaviour for selecting objects contained in BPMN pools and lanes. In the past, it was only possible to do free selection of multiple objects by clicking and dragging on the background of a diagram or on transparent objects.
Now, this behaviour has been adapted so that it works for BPMN pools and lanes containing objects, too. See the video below for a short demonstration.
Note: The feature explained in this article is available in ARIS Express and in the professional ARIS Platform products since service release 8 (SR08). There are additional articles available explaining BPMN modelling in ARIS and ARIS Express.