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A design system isn’t just for new work: you can apply it to an existing artifact, and Agent rebuilds the artifact’s look under the system.
1

Choose the target

Open the project with the artifact you want to restyle.
2

Apply the system

From the canvas: select the target frame, open its ⋯ menu, and choose Apply design system. Or ask for it in the composer (an Agent rebuild): “apply my design system to this app.”
The frame's three-dot menu with Apply design system highlighted
3

Confirm the rebuild

Applying a system to existing work is a real rebuild — you’ll see a time and credits warning before it starts. That’s expected: Agent is re-generating the artifact’s styling layer, not swapping a stylesheet.
4

Review the result

Check key screens against the system. Continued edits keep using the system — if you spot drift back to old styling, flag it in the chat.