By default, Phinix generates a wallet named Wallet 1, which is set as the default. If you've already imported another wallet and want to set it as the default, simply select it from the menu.
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Click on "Set Default Wallet"
Wallets that are not set as default will have a blue circle next to them.
When you click on the blue circle, it will turn green, indicating that the selected wallet is now your default wallet.