# Settings

> The lab's shared configuration (AI, Turnitin) managed by the admin, and each person's profile and appearance.

**Cài đặt** (Settings, `/app/settings`) has four sections: **Tổng quan** (Overview), **AI**, **Tương đồng** (Similarity) and **Hồ sơ cá nhân** (Profile). AI and Similarity are shared for the whole lab and only the system admin can change them; the Profile belongs to each person.

![Settings → Overview: AI and Turnitin status](../../../../assets/shots/cai-dat.webp)

## AI

Choose the **Nhà cung cấp** (Provider: Anthropic, OpenAI, or an OpenAI-compatible service with a **Base URL**), enter the **Khoá API** (API key), the **Trần chi phí (USD)** (Cost cap, USD) and a model for each job: **Model đối chiếu reviewer** (reviewer cross-check model), **Model chat / tách nhận xét** (chat / review-splitting model), **Model embedding**. Click **Lưu cài đặt AI** (Save AI settings).

- The key is encrypted with AES-256-GCM before it is written to the database; the interface only shows the key's fingerprint. Leaving the key field empty keeps the current key.
- An empty cost cap uses the server key's cap; the value must be greater than 0 and not exceed that cap. Every AI call is recorded against the key fingerprint.
- When the cap is reached, Ask AI, PDF reading during work creation and the reviewer cross-check stop and say so clearly; no fake results are returned.

![Settings → AI](../../../../assets/shots/cai-dat-ai.webp)

## Similarity (Turnitin)

Turn on **Bật kiểm tương đồng** (Enable similarity check), enter the **Turnitin tenant** and **Khoá API (TCA)** (API key), set **Ngưỡng cảnh báo (%)** (Warning threshold) and **Ngưỡng không đạt (%)** (Fail threshold); the warning threshold must be less than or equal to the fail threshold. Without a tenant or key the Similarity check reports "chưa cấu hình" (not configured) and makes no outside calls. When it is off, no job is sent to Turnitin.

![Settings → Similarity](../../../../assets/shots/cai-dat-tuong-dong.webp)

## Profile and appearance

- **Tên hiển thị** (Display name): shown on comments, the audit log and emails. Click **Lưu hồ sơ** (Save profile).
- **Email** is managed by the admin; you cannot change it yourself.
- **Giao diện** (Appearance): light, dark or system mode, and the **Màu nhấn** (Accent colour: Than chì/Graphite, Xanh dương/Blue, Chàm/Indigo, Tím/Violet, Lục bảo/Emerald, Hồng/Pink, Hổ phách/Amber). The choice is saved in the browser you are using and applies immediately; the account menu at the bottom of the sidebar can change it too.

![Settings → Profile and Appearance](../../../../assets/shots/ho-so.webp)