How to remove custom networks in MetaMask
All the networks you add are removable. Note that default networks like Ethereum Mainnet can't be removed.
- Extension
- Mobile
- Click the 'All networks' dropdown from the 'Tokens' tab.
- Click 'Manage networks'.
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Find the network you want to remove and click the 3 dots next to it.
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Click 'Disable' to remove the network.
- Tap 'Tokens' from the home screen.
- Tap the network dropdown at the top of the screen, which is set to 'Popular networks' by default.
- Tap the three dots by the network you want to remove and tap 'Delete'.
If you need to re-add a network, just follow the instructions here. If you enabled testnets and don't want to see them anymore, just toggle it off in settings or the network menu. See here for instructions.