Sync

Select profiles → Sync. The first one is the leader; what you do there happens in the others.

• Windows are tiled evenly on the monitor Kalkan is on (2 → side by side, 4 → 2×2, 6 → 3×2 …). Every window fits the screen; with many profiles the layout moves to more rows or to other monitors.
• Clicks target the same element, not the same pixel, so different window sizes are fine.
• Windows are numbered from 1 in the same order as on the taskbar (turn the numbers off in Settings → Sync). Profiles start in parallel; late ones take their reserved spot and join on their own.
• Password fields are never mirrored. A follower that lands on a different page (login, captcha) is paused, the rest continue.