NgRx Redux devtools not showing store and state details even though applicaton is working fine

To use the Redux devtools you'll have to install @ngrx/store-devtools and import it in the AppModule - docs.

Install it with:

npm install @ngrx/store-devtools --save 

Import it with:

@NgModule({
  imports: [
    StoreModule.forRoot(reducers),
    // Instrumentation must be imported after importing StoreModule (config is optional)
    StoreDevtoolsModule.instrument({
      maxAge: 25, // Retains last 25 states
      logOnly: environment.production, // Restrict extension to log-only mode
    }),
  ],
})
export class AppModule {}

There is an issue with Angular app when Redux doesn't see your Store

Check that you have

    StoreDevtoolsModule.instrument(...)

after

    StoreModule.forRoot(...)

Otherwise you are in trouble.

BTW, it is better to install DevTools with

ng add @ngrx/store-devtools

It adds schematich to the project.