In the current version (v83) if a user is working with the expand and collapse commands, there is a strange asymmetry of functionality.

 

If Parent X is expanded, i.e. children x,y and z are visible, by collapsing the X, the children would get collapsed. The nice thing is that even with them collapsed, the Collapse command still can be used to hide Parent X in favor of GrandParent Y, essentially mimicking collapse on the part of the grandparent.

 

The reverse is possible in InfoQube with Ctrl+Shift+1, 2, n-th level, but it would be much more comfortable to the user to just press the same shortcut over and over again, and have the levels unfold one at a time, i.e. ctrl+Left Arrow. And maybe have another command to expand all.