unteem · Oct 26, 2026
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -20,6 +20,8 @@ and this project adheres to
   from the site configuration in the Django admin
 - Warn that an auto-reply is active for the selected mailbox with a banner
   instead of a header icon
+- `with_proconnect` in `FRONTEND_THEME_CONFIG` replaces the ProConnect button
+  of the home page with a generic "Sign in" button
 
 ### Changed
 

diff --git a/docs/env.md b/docs/env.md
@@ -646,7 +646,7 @@ These settings are unset by default: an unset setting is omitted from the `/conf
 | Variable | Default | Description | Required |
 |----------|---------|-------------|----------|
 | `FRONTEND_SILENT_LOGIN_ENABLED` | `False` | Whether silent login is enabled | Optional |
-| `FRONTEND_THEME_CONFIG` | None (frontend defaults to `{"theme": "white-label"}`) | Theme configuration served to the frontend (`theme`, `terms_of_service_url`, `footer`), as JSON | Optional |
+| `FRONTEND_THEME_CONFIG` | None (frontend defaults to `{"theme": "white-label"}`) | Theme configuration served to the frontend (`theme`, `terms_of_service_url`, `footer`, `with_proconnect`), as JSON | Optional |
 | `FRONTEND_FORCED_DEFAULT_LANGUAGE` | None (frontend defaults to `False`) | When `True`, the frontend default language fallback is `LANGUAGE_CODE` instead of the browser language | Optional |
 | `FRONTEND_MULTIPART_UPLOAD_CHUNK_SIZE_MB` | None (frontend defaults to `100`) | Chunk size in MB for frontend multipart uploads | Optional |
 | `FRONTEND_HELP_CENTER_URL` | None | Help center URL | Optional |

diff --git a/docs/theme-customization.md b/docs/theme-customization.md
@@ -8,6 +8,15 @@ The theme configuration is a JSON object that contains the following properties:
 Each theme are available in two variants: `light` and `dark`.
 - `terms_of_service_url`: The terms of service URL that will be displayed in the user menu.
 - `footer`: Customize logo and links in the footer.
+- `with_proconnect`: Show the ProConnect button on the home page (default: `true`).
+Set it to `false` to display a generic "Sign in" button instead, e.g. when your
+OIDC provider is not ProConnect.
+
+Example:
+
+```json
+{"theme": "white-label", "with_proconnect": false}
+```
 
 ## About the footer
 

diff --git a/src/backend/core/api/openapi.json b/src/backend/core/api/openapi.json
@@ -344,7 +344,7 @@
                                         },
                                         "FRONTEND_THEME_CONFIG": {
                                             "type": "object",
-                                            "description": "Theme configuration for the frontend (theme, terms_of_service_url, footer)",
+                                            "description": "Theme configuration for the frontend (theme, terms_of_service_url, footer, with_proconnect)",
                                             "readOnly": true
                                         },
                                         "FRONTEND_FORCED_DEFAULT_LANGUAGE": {

diff --git a/src/backend/core/api/viewsets/config.py b/src/backend/core/api/viewsets/config.py
@@ -192,7 +192,7 @@ def resolve(self):
             "type": "object",
             "description": (
                 "Theme configuration for the frontend "
-                "(theme, terms_of_service_url, footer)"
+                "(theme, terms_of_service_url, footer, with_proconnect)"
             ),
         },
         required=False,

diff --git a/src/frontend/public/locales/common/en-US.json b/src/frontend/public/locales/common/en-US.json
@@ -815,6 +815,7 @@
   "Show logs": "Show logs",
   "Show more": "Show more",
   "Show window": "Show window",
+  "Sign in": "Sign in",
   "Sign in with another address": "Sign in with another address",
   "Sign out": "Sign out",
   "Sign out \"{{name}}\"": "Sign out \"{{name}}\"",

diff --git a/src/frontend/public/locales/common/fr-FR.json b/src/frontend/public/locales/common/fr-FR.json
@@ -815,6 +815,7 @@
   "Show logs": "En savoir plus",
   "Show more": "Afficher plus",
   "Show window": "Afficher la fenêtre",
+  "Sign in": "Se connecter",
   "Sign in with another address": "Se connecter avec une autre adresse",
   "Sign out": "Déconnecter",
   "Sign out \"{{name}}\"": "Déconnecter « {{name}} »",

diff --git a/src/frontend/src/features/api/gen/models/config_retrieve200.ts b/src/frontend/src/features/api/gen/models/config_retrieve200.ts
@@ -49,7 +49,7 @@ export type ConfigRetrieve200 = {
   readonly FRONTEND_SILENT_LOGIN_ENABLED: boolean;
   /** Sentry DSN shared with the frontend */
   readonly SENTRY_DSN?: string;
-  /** Theme configuration for the frontend (theme, terms_of_service_url, footer) */
+  /** Theme configuration for the frontend (theme, terms_of_service_url, footer, with_proconnect) */
   readonly FRONTEND_THEME_CONFIG?: ConfigRetrieve200FRONTENDTHEMECONFIG;
   /** Whether the frontend should fall back to LANGUAGE_CODE instead of the browser language */
   readonly FRONTEND_FORCED_DEFAULT_LANGUAGE?: boolean;

diff --git a/src/frontend/src/features/api/gen/models/config_retrieve200_frontendthemeconfi_g.ts b/src/frontend/src/features/api/gen/models/config_retrieve200_frontendthemeconfi_g.ts
@@ -7,6 +7,6 @@
  */
 
 /**
- * Theme configuration for the frontend (theme, terms_of_service_url, footer)
+ * Theme configuration for the frontend (theme, terms_of_service_url, footer, with_proconnect)
  */
 export type ConfigRetrieve200FRONTENDTHEMECONFIG = { [key: string]: unknown };
diff --git a/src/frontend/src/features/config/resolve.ts b/src/frontend/src/features/config/resolve.ts
@@ -5,6 +5,8 @@ export type ThemeConfig = {
   theme: "white-label" | "anct" | "dsfr";
   terms_of_service_url?: string;
   footer?: FooterProps;
+  /** Show the ProConnect button on the home page. Defaults to `true`. */
+  with_proconnect?: boolean;
 };
 
 export type FeedbackWidgetConfig = {

diff --git a/src/frontend/src/routes/index.tsx b/src/frontend/src/routes/index.tsx
@@ -1,6 +1,6 @@
 import { createFileRoute, useSearch } from "@tanstack/react-router";
 import { useTranslation } from "react-i18next";
-import { Hero, HomeGutter, Footer, ProConnectButton, useResponsive } from "@gouvfr-lasuite/ui-components";
+import { Button, Hero, HomeGutter, Footer, ProConnectButton, useResponsive } from "@gouvfr-lasuite/ui-components";
 
 import { login, useAuth } from "@/features/auth";
 import { MainLayout } from "@/features/layouts/components/main";
@@ -48,7 +48,15 @@ const HomePage = () => {
             title={t("Simple and intuitive messaging")}
             banner={`/images/banner-${variant}.webp`}
             subtitle={t("Send and receive your messages in an instant.")}
-            mainButton={<ProConnectButton onClick={handleLogin} />}
+            mainButton={
+              themeConfig.with_proconnect === false ? (
+                <Button onClick={handleLogin} className="login-button">
+                  {t("Sign in")}
+                </Button>
+              ) : (
+                <ProConnectButton onClick={handleLogin} />
+              )
+            }
           />
         </HomeGutter>
         {themeConfig.footer && (