Build a reusable UI kit

Promote repeated chrome to components and keep colors on Style Brain swatches.

Steps

Lay out one canonical button row and panel header on a dedicated artboard in Compose.
Select the row and Save component; insert instances on other screens via Smart Actions or the insert flow.
Define document color styles and link fills so recolor is centralized.
Duplicate screens for variants instead of duplicating raw layers when possible.
Export a UI kit ZIP from the export modal and inspect panels/, buttons/, and metadata folders.

Multiple screens sharing component instances and linked styles, plus a zip you can hand to engineering.

For deeper reference, open Docs.