Everyone at once — 10 clients, the technicians, 2 supervisors. Drag any session or supervisor block and watch the rules hold or turn red. Hit Solve to auto-arrange all ten legally. Pull a technician with Remove and watch exactly who can't be covered. This is the real engine, shown on one screen.
Drag tips: grab a colored session and slide it — if it collides with that technician's other client, runs past someone's hours, or pulls the supervisor outside the session, it flags red instantly. Solve re-packs everyone (with travel gaps); Remove a technician to see the capacity question — do I have the staff? — answered live.