The states are the different situations:
Solo
Party
Raid
Battleground
Arena
In RDX8, you have to create a desktop(or layout) per state. It was complicated to maintain.
In RDX9, the management of states has been integrated in the desktop object.
For each state, you specify which windows must be open and which windows must be closed.
Open the desktop tool, select the tab S
you can specify defined windows and test the state
I also add a button Reset state, it fill automatically windows to be opened\closed. Windows must respect the name specification.
Cheers