> ## Documentation Index
> Fetch the complete documentation index at: https://docs.fiddler.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# New Fiddler UI — Quick Start

> Fiddler's redesigned interface is now the default for Fiddler-hosted organizations. Find your way around the new sidebar, ML model pages, and Settings.

Fiddler's redesigned interface is now what you see when you sign in
to a Fiddler-hosted (SaaS) organization.
It covers both your GenAI applications and your ML models.
Your account, data, and Fiddler address stay the same —
only the layout and navigation are new.

> [!NOTE]
>
> **Who sees the new UI:** Fiddler-hosted organizations.
> Self-hosted deployments and organizations that connect through
> [AWS Virtual PrivateLink](/reference/administration/aws-vpl-setup)
> are not affected yet.

## Find Your Way Around

The **left sidebar** replaces the old top bar (light and dark themes available)
and has two parts:

* **Top — your selected application or model.**
  Pick one with the selector at the top of the sidebar,
  and its own pages appear right below it.
  For a GenAI application, these include **Overview**,
  **Explorer**, and **Evaluator Rules**.
  For an ML model, these include **Overview**, **Dashboard**, **Schema**, and **Baselines**.
  They stay put as you work, so you move between them without going back to a list.
  *This is the biggest change — and the biggest click-saver.*
* **Below — Workspace.**
  The org-wide areas: **Projects**, **Applications**, **Dashboards**, **Charts**, **Alerts**, and more.
  Depending on your organization, Workspace can also include **Mission Control**
  (a cross-application overview for GenAI, formerly "Executive Dashboard")
  and a **Predictive Models** list.

**Where you start:** when you sign in, you start on **Mission Control**
if your organization has it turned on; otherwise, you start on the **Projects** list.

> [!NOTE]
>
> The items you see depend on your organization's settings and your permissions,
> so your sidebar may differ from the screenshots on this page.

![The redesigned Fiddler left sidebar with an application selected: the application's own pages on top, and the org-wide Workspace areas below](https://mintcdn.com/fiddlerai/G09wC1jSL7g36xKd/images/new-ui-preview-sidebar.png?fit=max\&auto=format\&n=G09wC1jSL7g36xKd\&q=85\&s=558975f246440a6b1cb97b883a161572)

![The Mission Control page in the redesigned Fiddler UI on its GenAI view, showing app and trace totals, evaluator scores, and span traffic and token usage charts](https://mintcdn.com/fiddlerai/SmjNZHGpBh1BW_Af/images/new-ui-preview-mission-control.png?fit=max\&auto=format\&n=SmjNZHGpBh1BW_Af\&q=85\&s=d30bc3871a3b9066c616deb5e8fd271f)

## Monitoring ML Models

* **Open a model:** go to **Projects**, open a project, and select the model.
  If your organization has it turned on,
  the **Predictive Models** list under **Workspace** shows all your models in one place.
* **Investigate a change:** open a monitoring chart and click any data point.
  A **Root Cause Analysis** panel opens below the chart,
  with **Events**, **Analyze**, **Data Drift**, and **Data Integrity** tabs.
* **Add a model:** open an ML project and select **Add Model**.

![The redesigned Fiddler sidebar with an ML model selected, next to the model's Overview page showing its columns, baselines, segments, and custom metrics](https://mintcdn.com/fiddlerai/SmjNZHGpBh1BW_Af/images/new-ui-preview-ml-model-overview.png?fit=max\&auto=format\&n=SmjNZHGpBh1BW_Af\&q=85\&s=6aa08cac18af702271629a9e08ef7c4a)

![The Predictive Models list in the redesigned Fiddler UI, showing each model's onboarding date, column count, description, and project](https://mintcdn.com/fiddlerai/SmjNZHGpBh1BW_Af/images/new-ui-preview-predictive-models.png?fit=max\&auto=format\&n=SmjNZHGpBh1BW_Af\&q=85\&s=af4318054f9e14f152ac30df462e4302)

![A Feature Drift chart for an ML model with the Root Cause Analysis panel open below it on the Data Drift tab](https://mintcdn.com/fiddlerai/SmjNZHGpBh1BW_Af/images/new-ui-preview-ml-root-cause.png?fit=max\&auto=format\&n=SmjNZHGpBh1BW_Af\&q=85\&s=955cc344cee4bea3b7a718650b5295c1)

## Settings

**Settings** has four groups: **Organization**, **Access Control**, **Configuration**, and **Integrations**.
API keys are under **Settings → Credentials**.

## Still in the Previous Interface

The previous interface remains available for a limited time.
Some features are only there for now, including:

* **Saved views:** Bookmarks
* **Setting up ML models:** finishing or editing a draft model
  (draft models appear in the new UI, but read-only)

> [!TIP]
>
> Ask your Customer Success Manager how to open the previous interface.

**Old links:** most links and bookmarks from the previous interface open the same page in the new UI.
Some old links can't point to an exact page,
so they open a general page instead (such as the **Charts** or **Applications** list)
or a "Page not found" screen.
If that happens, look for the feature from there.
If you can't find it, it may only be in the previous interface for now.

## Tell Us What You Think

Share feedback on the new UI with your Fiddler Customer Success Manager.