At present the Ledger Live application does not support any Ethereum chains except for the main network.
However, you can use the Ledger hardware wallet with OP Mainnet through a software wallet such as MetaMask. Click here for the directions.
Additionally, to do anything with the Ledger hardware wallet and MetaMask, you need to turn on blind signing:
- Enter the Ethereum application (if you don't have it, install it from Ledger Live).
- On the Ledger device select Settings.
- Select Blind signing NOT Enabled to toggle the setting to enabled.
Blind signing means that MetaMask won't show you the transaction details. However, you will get a chance to see all the details on the Ledger device before you approve it.