> For the complete documentation index, see [llms.txt](https://docs.hackle.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.hackle.io/en/development-guide/flutter/flutter-user-explorer.md).

# User Explorer

{% hint style="info" %}
**It is recommended to use this only in Debug builds.**
{% endhint %}

This guide explains how to check the User Identifier and force-assign users to A/B Tests or Feature Flags.

Add the following code.

```dart
import "package:hackle/hackle.dart";

await HackleApp.initialize(YOUT_APP_SDK_KEY);

// Trigger this at the point where you want to display the User Explorer.
HackleApp.showUserExplorer();
```

A Hackle logo button is displayed at the bottom of the screen. Tapping the button opens the configuration screen.

![](/files/fdxpnGBiceda3xun4sOA)

## Check User Identifier

You can view and copy the User Identifier at the top of the screen.

![](/files/vGGsKdqk7jfDsPHhlsFY)

## Force Assign User

* You can check the Variation Distribution results for A/B Tests and Feature Flags at the bottom of the screen.
* Tapping a SelectBox lets you force-assign a user to a specific group.
* Tapping the `Reset` button removes the force assignment.
* Tapping `Reset all` removes all force assignments.
* Force assignments made in the app only apply when distribution is performed within the app. (The device is not registered as a Test Device in the Dashboard.)
* If the force assignment does not take effect, fully close the app and relaunch it.

![](/files/1Pn2kETT4dZeNL6FiXGp)

![](/files/mQELar4HvQuTYi5EBndu)


---

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