All demo pages are in separate modules.

1. Remove demo pages folder:

   [metronic]/theme/angular_new/[demo]/src/app/modules/e-commerce

   [metronic]/theme/angular_new/[demo]/src/app/modules/user-management

   [metronic]/theme/angular_new/[demo]/src/app/modules/material

   [metronic]/theme/angular_new/[demo]/src/app/modules/ngbootstrap

   [metronic]/theme/angular_new/[demo]/src/app/modules/wizards

   Leave auth, i18n and errors folder. Auth is required for authentication module like login and register page. errors is required for 404 page redirect (* you able to keep only error page and remove others). i18n is required for application localization.

2. Remove demo pages from Routing in file [metronic]/theme/angular_new/[demo]/src/app/pages/pages-routing.module.ts:

   Remove code from row20 to 55

   // Other code
     // {
         //   path: 'ecommerce',
         //   loadChildren: () =>
         //     import('../modules/e-commerce/e-commerce.module').then(
         //       (m) => m.ECommerceModule
         //     ),
         // },
         // {
         //   path: 'user-management',
         //   loadChildren: () =>
         //     import('../modules/user-management/user-management.module').then(
         //       (m) => m.UserManagementModule
         //     ),
         // },
         // {
         //   path: 'ngbootstrap',
         //   loadChildren: () =>
         //     import('../modules/ngbootstrap/ngbootstrap.module').then(
         //       (m) => m.NgbootstrapModule
         //     ),
         // },
         // {
         //   path: 'wizards',
         //   loadChildren: () =>
         //     import('../modules/wizards/wizards.module').then(
         //       (m) => m.WizardsModule
         //     ),
         // },
         // {
         //   path: 'material',
         //   loadChildren: () =>
         //     import('../modules/material/material.module').then(
         //       (m) => m.MaterialModule
         //     ),
         // },

3. Remove demo pages links from Aside Menu Static in file [metronic]/theme/angular_new/[demo]/src/app/pages/_layout/components/aside/aside.component.html: (*if you are using static aside) Remove all html code from row 77 to 1483
4. Remove demo pages links from Aside Menu Dynamic in file [metronic]/theme/angular_new/[demo]/src/app/_metronic/configs/dynamic-aside-menu.config.ts: (*if you are using dynamic aside) Remove all html code from row 19 to 347
5. Remove demo pages links from Header Menu Static in file [metronic]/theme/angular_new/[demo]/src/app/pages/_layout/components/header/header-menu/header-menu.component.html: (*if you are using static header) Remove all html code from row 24 to 1177
6. Remove demo pages links from Header Menu Dynamic in file [metronic]/theme/angular_new/[demo]/src/app/_metronic/configs/dynamic-header-menu.config.ts: (*if you are using dynamic header) Remove all html code from row 16 to 389

All dashboard widgets can be easily removed.

1. Remove dashboard+widgets folders:

   [metronic]/theme/angular_new/[demo]/src/_metronic/partials/content/dashboards

   [metronic]/theme/angular_new/[demo]/src/_metronic/partials/content/widgets

2. Remove Dashboard imports in dashboard module [metronic]/theme/angular_new/[demo]/src/app/pages/dashboard/dashboard.module.ts:

   import { NgModule } from '@angular/core';
   import { CommonModule } from '@angular/common';
   import { RouterModule } from '@angular/router';
   import { DashboardComponent } from './dashboard.component';
   // import { DashboardsModule } from '../../_metronic/partials/content/dashboards/dashboards.module';
   
   @NgModule({
     declarations: [DashboardComponent],
     imports: [
       CommonModule,
       RouterModule.forChild([
         {
           path: '',
           component: DashboardComponent,
         },
       ]),
       // DashboardsModule,
     ],
   })
   export class DashboardModule {}
   

3. Remove Dashboard component in dashboard page [metronic]/theme/angular_new/[demo]/src/app/pages/dashboard/dashboard.component.html:

   <!-- <app-dashboard-wrapper></app-dashboard-wrapper> -->