Detached tasks are tasks that are not connected to any other tasks.  The dialog provides tools for isolating, filtering, grouping, and printing the detached tasks so that the team can review and incorporate those tasks in the workstreams.  Once you have identified the tasks of interest, you can isolate them in the main plan window for further editing. 
 
|  Layout RatioUse the Layout Ratio option to automatically arrange the tasks to fit a rectangle of the proportions identified in the ratio settings. | 
|  SpacingSets the distances (vertical and horizontal) between the tasks. | 
|  Group ByApply a grouping setting to arrange the activities. | 
|  Isolate and CloseIsolate the visible tasks in the main plan window. | 
|  FiltersControl which tasks to display.  You can also right-click and hide specific activities. |