That's Amethyst's relay login prompt (NIP-42 auth). Some relays, here relay.44billion.net, ask who you are before they'll serve certain content, and the prompt is Amethyst asking whether to tell them. To stop it popping up, use the buttons on the prompt itself: - "Remember for this relay" + Log in ...

nostr:nprofile1qqs9w2ddnyd8ur9c39cua535savpq4us65gkpgymytgd3uuu5a3duygn6uwg9 that is the relay asking you to prove who you are (NIP-42 auth), and Amethyst now asks per relay. flip Remember for this relay, tap Log in, and it stops asking on every scroll. i only say yes to relays i know.