If you are analyzing a very high-frequency circuit, the dots might move too fast to see. You can pause the simulation and use the step-by-step forward button to watch the circuit state change microsecond by microsecond.
The core of this focuses on the three main zones of the sandbox: everycircuit manual
If your circuit doesn't work, consult this flowchart. If you are analyzing a very high-frequency circuit,
For advanced behavior beyond the built-in help, consult: everycircuit manual