web/src/app/layouts/user-layout.component.ts

import {
    Component,
    OnInit,
} from '@angular/core';

@Component({
    selector: 'app-user-layout',
    templateUrl: 'user-layout.component.html',
})
export class UserLayoutComponent implements OnInit {
    ngOnInit() {
        document.body.classList.remove('layout_frontend');
    }
}