New navigation menu design moves navigation to left sidebar in order to save some vertical space. The sidebar with navigation links has two modes - collapsed, with icon-only link, and expanded, with full-text links. By default, it's kept collapsed, but user can click on toggle sidebar button left of logo to expand or collapse it again. For now, the sidebar state does not persist between page reloads. The footer should be moved to expanded sidebar, except for public screens like "sign in" or "reset password". Navigation links block in sidebar should scroll and indicate that some content is hidden when viewport height is low enough.