To access developer settings, follow these steps:

1. Select your profile avatar in the upper left.
2. Go to Settings → Developer Settings.

Settings in the browser extension:

• Testnet Mode: Enable testnet networks for development. Applies to balances and app connections. See About mainnet, testnet, and devnet networks in Phantom.
• Enable Copy Transaction: Copy transaction details to the clipboard.
• Auto-Confirm on localhost: Skip confirmation prompts when testing on localhost.

Settings in the mobile app:

• Testnet Mode: Enable testnet networks for development. Applies to balances and app connections. See About mainnet, testnet, and devnet networks in Phantom.
• Web View Debugging: Debug mobile web apps using a desktop browser. See Mobile web debugging in our developer docs.
• Auto-Confirm on localhost: Skip confirmation prompts when testing on localhost.