Understand the Simulator: The simulator is integrated into Flux and is always running whenever you're designing a circuit, so you don't need to manually start or stop it[1].

Visibility of Metrics: Not all simulation parameters are visible by default. To make them visible, select a part and open the "Simulation" menu on the top-right of the screen. Use the eye-type icon to toggle the visibility of each parameter[1].

Simulator Menu: If no object is selected (click on an empty space on the canvas), you can access a menu that lets you control various simulation settings, such as how fast the simulation runs, and the number of simulation steps. If an object is selected, a specific menu for that object's simulation will be shown[2].

Creating Simulated Parts: If you want to create your own parts with their own interactions or models for the simulator, you can find more information and support by joining the Flux community on Slack[1].

Interacting with Simulated Parts: Some parts allow you to interact with them as part of their simulation. For example, you might be able to press a button in the simulation and see how the rest of the circuit reacts[1].

Simulation Restart: You can restart the simulation process from the initial conditions by clicking the rewind-clock icon in the simulation menu[2].