---
title: "Fast Line Pro interface"
description: "New Fast Line navigation, PrimeVue UI, and where to find agents, knowledge bases, and search check."
---

# Fast Line Pro interface

How the updated Fast Line / Fast Line Pro workspace in Constructor is organized: navigation, new UI, and key screens.

## When you need this

- You are used to legacy **Fast Line** and cannot find agents or knowledge bases.
- You need to locate **Search check**, chunk export, or knowledge base settings.
- An administrator plans to enable the updated interface, or to roll back to the legacy one.

> Both toggles below are **off by default**. Until an administrator turns them on for your
> instance, Constructor looks exactly as it did before — this page describes what changes
> once they are enabled.

## What changed

### Single entry point — Fast Line Pro

With **Fast Line Pro only** enabled, the main Constructor menu item is **Fast Line Pro** (Ukrainian UI may show **Fast Line - AI agents**):

- **Agents** — powerful AI agents with tools.
- **Chat bots** — simple assistants.
- **Knowledge base** — documents, chunks, search parameters.

Legacy **Fast Line** (older module with statistics/import sections) then stays hidden; it is visible while the toggle is off.

### New interface (PrimeVue)

With **Fast Line PrimeVue UI** enabled, Fast Line and Fast Line Pro screens use an **updated interface** (tables, buttons, forms, dialogs) instead of legacy Vuetify:

- agent, chat bot, and knowledge base lists;
- documents and chunks;
- **Search check**;
- chunk export/import (when the feature is enabled).

**Search check** and chunk export/import are available in both the legacy and the updated interface — they do not depend on this toggle.

## Where to find things

| Task | Where in the UI |
|------|----------------|
| Check what retrieval finds | Knowledge base → documents → **Search check** |
| Bulk-edit chunk text | Knowledge base → documents → **Export** / **Import changes** |
| Configure search methods | Knowledge base → **Knowledge base settings** |
| Create an agent | **Agents** → create |
| Attach a knowledge base to an agent | Agent card → knowledge bases |

## Instance settings (administrators)

**Settings** → **Instance settings** → **Feature flags** → **Fast Line Pro**:

| Toggle | Default | Effect |
|--------|---------|--------|
| **Fast Line PrimeVue UI** | Off | `1` → PrimeVue interface; off → legacy UI |
| **Fast Line Pro only** | Off | `1` → Fast Line Pro only in menu; off → legacy Fast Line stays visible |

See [Administrator hub](/en/fastlinepro/explanation/admin-hub.md) for admin workflows.

## Related guides

- [Test knowledge base retrieval](/en/fastlinepro/explanation/how-to/test-kb-retrieval.md)
- [Export and import chunks](/en/fastlinepro/explanation/how-to/export-import-kb-chunks.md)
- [Integrator hub](/en/fastlinepro/explanation/integrator-hub.md)