I would like to set the default component for my child component. how to do that? here is my router.ts
{
        path: 'cpServices',
        component: CpServiceComponent,
        children: [
            {
                path: '',
                redirectTo: 'contentPlaceholder',
                pathMatch: 'full'
            },
            {
                path: 'contentPlaceholder', //child has outlet
                component: ShellContentPlaceholderComponent,
                children : [
                    {
                        path: 'create', //need as default
                        component: ShellContentCreatePlaceholderComponent
                    }
                ]
            }
        ]
    }
Addition Request
<div class="site-wrapper">
    <header-nav-shell></header-nav-shell>
    <div class="main-section">
        <div class="content-left"> //some times need to hide this, how?
            <side-nav-shell></side-nav-shell>
        </div>
        <div class="content-right">
            <router-outlet></router-outlet>
        </div>
    </div>
    <app-footer></app-footer>
</div>
 
    