demo1/src/app/_metronic/layout/core/configs/dark-sidebar.config.ts
app.footer.fixed.desktop
to true. demo1/src/app/_metronic/layout/layout.component.ts
this.appFooterFixedDesktop = this.layout.getProp('app.footer.fixed.desktop', config) as boolean;
if (this.appFooterFixedDesktop) {
document.body.setAttribute('data-kt-app-footer-fixed', 'true')
}
this.appFooterFixedMobile = this.layout.getProp('app.footer.fixed.mobile') as boolean;
if (this.appFooterFixedMobile) {
document.body.setAttribute('data-kt-app-footer-fixed-mobile', 'true')
}