| Double-click canvas | Add a new bubble |
| Drag bubble | Move it around the canvas |
| Click bubble | Select and edit its text |
| Edge dots | Drag from a dot to another bubble to connect them |
| × on a line | Delete that connection |
| × badge | Delete the selected bubble |
| Color swatches | Choose color before adding, or recolor selected bubble |
| Scroll / pinch | Zoom in and out |
| Space + drag | Pan the canvas |
| Delete key | Delete selected bubble |
