Possible causes:
1. Accidentally removed — click the slider icon top right and then + Add widget. Add the desired widgets back.
2. Layout reset — did a colleague press the "Default layout" button? Reconfigure your own layout.
3. Browser cache — hard refresh (`Cmd+Shift+R` or `Ctrl+Shift+R`) to refresh cached layout.
4. No data — some widgets (revenue chart, pipeline stats) show nothing if there's no data yet. Add clients/leads first.
Reset widgets to default: slider icon → Reset layout.