The panic button hasn’t yet graduated to a full, native feature—you need to enable the Early Bird mode in the browser.

Opera GX has developed the Panic Button, a tool that allows users to quickly hide their browsers, games, and videos with the press of a button. The Panic Button is supremely easy to use, with a ...

Access the panic button by pressing the F12 key, which will cause the Opera GX browser to quickly close all your active windows, and replace them with a benign web page.