Workspace is the main React component that you are going to use to display the drawings and interact with them. All manipulations with canvas are made via Store.

import { Workspace } from 'polotno/canvas/workspace';
import { createStore } from 'polotno/model/store';
const store = createStore({
key: YOUR_API_KEY // you can create it here:
const App = () => {
return <div><Workspace store={store} /></div>;

The Workspace will automatically take full width and height of its parent. So you don't have adjust its size manually. You can just setup the size of parent <div> with CSS.