BootstrapAdmin11/Bootstrap.Client/wwwroot/css/site-responsive.css

@media (min-width: 667px) {
    .header .nav {
        display: flex;
        flex: 1 1 auto;
    }

    .sidebar-toggle-box {
        flex: 0 1 auto;
    }
}

@media (min-width: 769px) {
    footer {
        display: flex;
    }

    aside {
        display: none;
    }
}