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---
title: Vue d'ensemble
description: Placez votre application à l’intérieur de l’interface de Twenty — entrées de barre latérale, vues enregistrées, onglets de page d’enregistrement et composants React isolés.
icon: table-columns
---
La **couche de mise en page** d’une application Twenty est tout ce que l’utilisateur voit : où l’application apparaît dans la barre latérale, quelles vues de liste elle fournit, comment ses pages de détails d’enregistrement sont organisées et quels composants React personnalisés sont rendus à l’intérieur de ces pages.
```text
Sidebar Record list Record detail page
─────── ─────────── ──────────────────
[📋 My View] ────▶ ┌──────────┐ ┌─────────────────────┐
[📋 Drafts ] │ Companies│ │ Tabs: [Overview ] │
[📋 Inbox ] │ ──────── │ │ [Notes ] │
▲ │ Apple │ │ [Hello ]◀──── definePageLayoutTab
│ │ Acme │ │ │ adds a tab...
└ defineNavi- │ … │ │ ┌────────────────┐ │
gationMenu- └────▲─────┘ │ │ │ │
Item points │ │ │ React UI │◀── …with a
to a defineView │ │ │ (sandboxed in │ │ defineFrontComponent
└ defineView │ │ a Worker) │ │ widget inside
picks columns │ └────────────────┘ │
and filters └─────────────────────┘
```
## Dans cette section
<CardGroup cols={2}>
<Card title="Vues" icon="list" href="/l/fr/developers/extend/apps/layout/views">
`defineView` — configurations de listes enregistrées : colonnes visibles, filtres, groupes.
</Card>
<Card title="Éléments de menu de navigation" icon="bars" href="/l/fr/developers/extend/apps/layout/navigation-menu-items">
`defineNavigationMenuItem` — entrées de barre latérale pointant vers des vues ou des URL externes.
</Card>
<Card title="Mises en page" icon="table-columns" href="/l/fr/developers/extend/apps/layout/page-layouts">
`definePageLayout` et `definePageLayoutTab` — onglets et widgets sur la page de détails d’un enregistrement.
</Card>
<Card title="Composants frontaux" icon="window-maximize" href="/l/fr/developers/extend/apps/layout/front-components">
`defineFrontComponent` — composants React isolés rendus à l’intérieur de Twenty.
</Card>
<Card title="Éléments du menu de commande" icon="terminal" href="/l/fr/developers/extend/apps/layout/command-menu-items">
`defineCommandMenuItem` — enregistre des composants frontaux comme entrées Cmd+K et actions rapides.
</Card>
</CardGroup>
## Où l’application apparaît
| Surface | Ce qu'il contrôle | Entité |
| ------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------- |
| **Barre latérale** | Une entrée personnalisée pointant vers une vue enregistrée ou une URL externe | `defineNavigationMenuItem` |
| **Liste des enregistrements** | Une configuration enregistrée pour un objet — colonnes visibles, ordre, filtres, groupes | `defineView` |
| **Page de détails de l’enregistrement** | Les onglets et widgets sur une page d’enregistrement (celle de votre propre objet ou une page standard) | `definePageLayout`, `definePageLayoutTab` |
| **À l’intérieur de n’importe lequel des éléments ci-dessus** | Un widget React personnalisé — boutons, formulaires, tableaux de bord, intégrations | `defineFrontComponent` |
| **Paramètres de l’application** | Une section de configuration personnalisée dans l’onglet Paramètres de l’application, au lieu de l’interface utilisateur par défaut des variables | `defineSettingsFrontComponent` |
| **Menu de commande (Cmd+K)** | Une action rapide épinglée ou une commande masquée | `defineCommandMenuItem` |
Les composants frontaux s’exécutent à l’intérieur d’un Web Worker isolé en utilisant Remote DOM — ils sont rendus *nativement* dans la page (et non dans une iframe), mais ne peuvent pas accéder directement à la page hôte ou au DOM. La communication avec Twenty se fait via une API hôte de passage de messages.
Elles sont encore en cours de développement actif : le bac à sable implémente un DOM partiel, donc les usages avancés peuvent échouer. Voir [Limitations actuelles](/l/fr/developers/extend/apps/layout/front-components#current-limitations).