After opening a sample you can start the simulation by selecting simulation/Start Simulation.
or pressing the [Enter] key. The simulation is now started and the results of the simulation are drawn in the scopes and the animation will be visible.
At the end of the simulation you can continue the simulation by selecting the continue button or by pressing the [ENTER] key
If the "wait after screen" button is enabled, the simulation will stop at the end of the screen
If this button is not pressed, the simulation will continue at the end of the screen.