You also need `npm` in version 7 (because of 2nd version of lockfile which was introduced there) which comes with Node.js 15 or newer. To simplify installation of proper versions you can make use of [nvm](https://github.com/nvm-sh/nvm#installing-and-updating) and run `nvm install`– it will activate proper Node.js version in your current command prompt session.
5. In command prompt run **`npm run hot`** which will compile app to the `/build` folder, serve under [http://localhost:3000](http://localhost:3000), then open in your browser. Moreover, it restarts server every time you save your changes in a codebase. You can go even further by running `npm run hot:reload`, which will also trigger webpage reloads.
Some feature might be hidden by default. Functions to enable/disable them are available inside global `featureToggles` and operate on a `window.localStorage`.
For example use `featureToggles.enableEllipseTool()` to make ellipse tool button visible. Then `featureToggles.disableEllipseTool()` to hide it.