If you created a Passphrase Account, you can export your 12-word recovery phrase from your Current Account menu (select your account via the top-right icon on the Home Screen, or go to Profile on the bottom aisle → under Current Account select Manage Accounts → export passphrase).
If you created your wallet using a social login (zkLogin like Google/Twitch/Facebook), there is no private key or mnemonic to view or export, as access is tied to the social account. You can seamlessly log in on multiple devices without having any concerns.
How it works is that you have an account, and we provide the application to be used on multiple platforms and different environments.