How to view testnets in MetaMask

If you want to use the Ethereum testnets Goerli and Sepolia, or previously added testnets for other networks, flick the 'Show test networks' toggle accessible via the network selector: 

Extension Mobile
MetaMask show test networks extension

Alternatively, on Extension you can also configure whether testnets are displayed by going to Settings > Advanced: 

MetaMask settings show test networks

Once this setting is turned on, switch to a testnet by heading to the network selector at the top of the homepage and scrolling until you find the one you need:

MetaMask switch to test network extension

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