From the left-hand menu, go to People > Org chart.
On the screen that opens, open the three-dot menu at the top right of a department card and choose Edit managers. The people at the top of the chart are chosen with the pencil icon on the Top Management card.
In the window that opens, choose the department's managers. To place a department under another one, use Change upper department in the same menu; the department's employees come from their position records automatically. This builds the department-based org chart.
Save completes the process.