This is the new LazyLibrarian interface, still in beta. Pages it does not have yet open in the classic one. You can go back to the classic interface at any time from the menu.
LazyLibrarian Telemetry
LazyLibrarian has the ability to send basic information about the installation, how it is configured, and how it is used to a server. This helps the developers figure out where it is worth improving, and which parts nobody uses. All telemetry information is 100% anonymized.