To run a real-time preview of a Lightning web component directly inside VS Code or Code Builder, use the Live Preview Visual Studio Code extension. This extension is now generally available for Lightning web components.
Where: This change applies to Lightning Experience in all editions.
How: This feature, previously known as Lightning Preview, is now called the Live Preview Visual Studio Code extension.
For information about using this extension with React components, check out Agentforce Vibes Developer Guide: Build and Deploy a React App Using Agentforce Vibes.