yarn

yarn start

To have the interface default to a different network when a wallet is not connected:

1. Make a copy of .env named .env.local
2. Change REACT_APP_NETWORK_ID to "{YOUR_NETWORK_ID}"
3. Change REACT_APP_NETWORK_URL to e.g. "https://{YOUR_NETWORK_ID}.infura.io/v3/{YOUR_INFURA_KEY}"