Public addresses—such as the "Current Address" displayed on every wallet screen in both QR and text form can only be used to receive digital assets. They're what you share with the other party in a transaction. If someone were to get a screenshot of your main wallet screen, they wouldn't be able to remove any digital assets associated with that address. The only way they could gain access to your digital assets is by accessing the private key associated with your address. Private keys "sign" the transaction; without that digital signature, the sender can't "prove" they control the address associated with those digital assets, and no transaction will take place.
Like public addresses, private keys are data strings that can be represented in plain text or graphic form. Unlike public addresses, however, they should not be shared with third parties unless you want to grant them access to remove digital assets (e.g., a family member or trusted friend).
Since Jaxx Liberty is an HD wallet, it generates new addresses in order to hide your full balance from the public blockchain. You can see all of the address/key pairs associated with your wallet at Menu > Tools > Display Private Keys.