The simulation shows a capacitor being discharged through a resistor.
The left hand meter shows the voltage across the resistor. The right hand meter shows the voltage between the plates of the capacitor.
The capacitor is initially charged. Start the simulation and after a short period the switch will close and the capacitor will start to discharge. The simulation keeps repeating.
The red arrow shows the current flow in the circuit, The green arrows show the electric field between the plates.