(For example, in a system with 2 identical systems to be controlled individually. (left part of the screen for one system and right part of the screen for the second system)

One cannot have more than on selector-view in a the same view, but you can have 2 views on your screen (add two identical views to the Guest-list of a device with a Display, one for each system), and each view can contain one selector-view. It is also possible that you open the two selector-views from two buttons, and each selector-view then will exists in each view (window).