Sushi is available across various EVM compatible networks. Networks can be interchanged directly through the UI at https://app.sushi.com/swap.
Step 1: Click on the icon of the network which you are currently connected to. It's near the top right hand corner of the Sushi UI (The example shown below is ‘Ethereum’).
Step 2: A menu of networks will pop up. Choose the network you wish to connect to from the list.
Step 3: Click on ‘Switch Network’ via MetaMask's UI.
When adding a new network to MetaMask, a prompt will pop up allowing you to verify the information pertaining to it. Click on 'Approve' and the new network will be added automatically to your MetaMask.