Hi Petr, also here is an illustration of how the right-click is set up, this may be clearer.

So in the following I am right-clicking on some items without Ctrl down. As you can see this produces an "isolate" of the item that is clicked on where it becomes the only active (visible) item and all other things deactivated (hidden). Then notice the final click - if you right-click on an item that is already isolated, everything will reset:



So now here I am repeating the same sequence but instead holding down Ctrl. You can see that the action is the same, except it applies Unlocked / Locked as what is meant by Activated / Deactivated:



So that's basically what the right-click is mean for, either with Ctrl or not, Ctrl just applies it as locking/unlocking things rather than hiding/showing. But the basic mechanism to "isolate" the item being clicked is the same.

- Michael