Remove a state from a workflow process
To remove a state from a workflow process, right click it, then select in the popup menu Delete State.
After a confirmation dialog, the state is removed from the process.
Note that the state removal from a process doesn't mean that the state has been completely deleted. The state is still existing and can be added to this or other processes.
Note also that until you save to the parameter file, the changes are not final, so if you close the Designer without saving, the state at all effects is not removed from the process.