Not every component in Multisim supports key assignments. The primary components with this capability fall into two categories: and Digital Interactive Components .
: You will see the switch arm move or the component's state change on the schematic, which immediately affects the circuit's behavior (e.g., turning an LED on or off). How to Change the Interactive Key
While "Space" is the default, you can customize these triggers to control specific parts of your circuit independently.
The "Key = Space" text is a visual indicator for the user. You can usually hide or show this label by right-clicking the component, selecting Properties , and navigating to the Display tab.