All demo pages are in separate modules.

1. Remove demo pages folder:

   [metronic]/theme/react/[demo]/src/app/modules/ECommerce

   [metronic]/theme/react/[demo]/src/app/modules/GoogleMaterialExamples

   [metronic]/theme/react/[demo]/src/app/modules/ReactBootstrapExamples

   Leave Auth and ErrorsExamples folder. Auth is required for authentication module like login and register page. ErrorsExamples is required for 404 page redirect (* you able to keep only error page and remove others).

2. Remove ECommerce mock dependencies in file [metronic]/theme/react/[demo]/src/redux/__mocks__/mockAxios.js:

   import MockAdapter from "axios-mock-adapter";
   import mockAuth from "../../app/modules/Auth/__mocks__/mockAuth";
   // import mockCustomers from "../../app/modules/ECommerce/__mocks__/mockCustomer";
   // import mockProducts from "../../app/modules/ECommerce/__mocks__/mockProduct";
   // import mockRemarks from "../../app/modules/ECommerce/__mocks__/mockRemark";
   // import mockSpecifications from "../../app/modules/ECommerce/__mocks__/mockSpecification";
   
   export default function mockAxios(axios) {
     const mock = new MockAdapter(axios, { delayResponse: 300 });
   
     mockAuth(mock);
     // mockCustomers(mock);
     // mockProducts(mock);
     // mockRemarks(mock);
     // mockSpecifications(mock);
   
     return mock;
   }

3. Remove ECommerce redux reducers dependencies in file [metronic]/theme/react/[demo]/src/redux/rootReducer.js:

   import {all} from "redux-saga/effects";
   import {combineReducers} from "redux";
   
   import * as auth from "../app/modules/Auth/_redux/authRedux";
   // import {customersSlice} from "../app/modules/ECommerce/_redux/customers/customersSlice";
   // import {productsSlice} from "../app/modules/ECommerce/_redux/products/productsSlice";
   // import {remarksSlice} from "../app/modules/ECommerce/_redux/remarks/remarksSlice";
   // import {specificationsSlice} from "../app/modules/ECommerce/_redux/specifications/specificationsSlice";
   
   export const rootReducer = combineReducers({
     auth: auth.reducer,
     // customers: customersSlice.reducer,
     // products: productsSlice.reducer,
     // remarks: remarksSlice.reducer,
     // specifications: specificationsSlice.reducer
   });
   
   export function* rootSaga() {
     yield all([auth.saga()]);
   }
   

4. Remove demo pages from Routing in file [metronic]/theme/react/[demo]/src/app/pages/BasePage.js:

   import React, {Suspense} from "react";
   import {Redirect, Switch} from "react-router-dom";
   import {LayoutSplashScreen, ContentRoute} from "../_metronic/layout";
   import {BuilderPage} from "./pages/BuilderPage";
   import {MyPage} from "./pages/MyPage";
   import {DashboardPage} from "./pages/DashboardPage";
   
   export default function BasePage() {
       // useEffect(() => {
       //   console.log('Base page');
       // }, []) // [] - is required if you need only one call
       // https://reactjs.org/docs/hooks-reference.html#useeffect
         <Suspense fallback={<LayoutSplashScreen/>}>
               <Switch>
                   {
                       /* Redirect from root URL to /dashboard. */
                       <Redirect exact from="/" to="/dashboard"/>
                   }
                   <ContentRoute path="/dashboard" component={DashboardPage}/>
                   <ContentRoute path="/builder" component={BuilderPage}/>
                   <ContentRoute path="/my-page" component={MyPage}/>
                   <Redirect to="error/error-v1"/>
               </Switch>
           </Suspense>    );
   }

5. Remove demo pages links from Aside Menu in file [metronic]/theme/react/[demo]/src/_metronic/layout/components/aside/aside-menu/AsideMenuList.js: Remove all html code from row 47 to 1465
6. Remove demo pages links from Header Menu in file [metronic]/theme/react/[demo]/src/_metronic/layout/components/header/header-menu/HeaderList.js: Remove all html code from row 29 to 1001

All dashboard widgets can be easily removed.

1. Remove dashboard+widgets folders:

   [metronic]/theme/react/[demo]/src/_metronic/_partials/dashboards

   [metronic]/theme/react/[demo]/src/_metronic/_partials/widgets

2. Remove Dashboard imports in file [metronic]/theme/react/[demo]/src/_metronic/_partials/index.js:

   // export {Dashboard} from "./dashboards/Dashboard";
   export {Builder} from "./builder/Builder";

3. Remove Dashboard component dependencies in file [metronic]/theme/react/[demo]/src/app/pages/DashboardPage.js:

   import React from "react";
   
   export function DashboardPage() {
     return <></>;
   }