Datastore - flow no emits new value after change

I cannot receive changes in the data store. After changing the database mode in the settings on the main screen the app should observe another source of data.

@Singleton
class SettingsRepositoryImpl @Inject constructor(
    @ApplicationContext private val context: Context
) : SettingsRepository {
    private val Context.dataStore: DataStore<Preferences> by preferencesDataStore(name = "user_prefs")

 override val databaseMode: Flow<String>
        get() =
            context.dataStore.data.map { preferences ->
                preferences[DATABASE_MODE_KEY] ?: DatabaseMode.LOCAL.name
            }.distinctUntilChanged()

/// Viewmodel ->
viewModelScope.launch(Dispatchers.Default) {
            observeDatabaseModeUseCase().collect { databaseMode ->
                observeAllProductsUseCase(databaseMode).map { products ->
                    getFilteredProductListUseCase(
                        products,
                        filterProductDataState.value.filterProduct
                    )
                }.collect {
                    _uiState.value = MyPantryProductsUiState.Loaded(
                        MyPantryModel(
                            groupsProduct = getGroupProductListUseCase(it),
                            loadingVisible = false
                        )
                    )
                }
            }
        }

I tried all dispatchers. I don't know why It's not emitting new values after

You're collecting an infinite flow inside another flow's collection block. So when the first item from the outer flow is emitted, it starts collecting the inner flow forever and a second item of the outer flow can never be emitted. Use flatMapLatest instead. This will make it interrupt the secondary flow whenever the first flow emits a new item.

//In ViewModel init:
observeDatabaseModeUseCase()
    .flatMapLatest { databaseMode ->
        observeAllProductsUseCase(databaseMode)
    }.map { products ->
        getFilteredProductListUseCase(
            products,
            filterProductDataState.value.filterProduct
        )
    }.onEach {
        _uiState.value = MyPantryProductsUiState.Loaded(
            MyPantryModel(
                groupsProduct = getGroupProductListUseCase(it),
                loadingVisible = false
            )
        )
    }
    .flowOn(Dispatchers.Default) // probably unnecessary since you don't seem to be doing blocking work.
    .launchIn(viewModelScope)

You didn't show what _uiState is, but possibly you can make it a StateFlow using stateIn on the above to simplify your code.