The SFTP feature allows users to securely access server files. SFTP connection details can be retrieved by navigating to a server and in the sidebar, selecting System -> SFTP details.

While a "Launch SFTP" button is provided, note that only certain SFTP clients, like FileZilla, support this feature. It would open sftp:// URL in the browser.
Every server has distinct connection details. The displayed username corresponds to the user currently viewing the page. SFTP password matches your Panel login password.
Make sure to choose SFTP protocol in your SFTP client. There’s a distinct difference in SFTP and FTP connections - S stands for secure and encrypts all data during transit. FTPS is also not SFTP as it relies on FTP.