diff --git a/SPECS.md b/SPECS.md
index 0ec7454..d5fa8e9 100644
--- a/SPECS.md
+++ b/SPECS.md
@@ -114,6 +114,9 @@ tyre pressures, GPS (lat, lon, elevation, heading) and the is_* flags. It does *
   INGEST_TOKEN) into git and pushed it. Commit amended and force-pushed; both values regenerated in
   the now gitignored `k8s/secrets.yaml` (since moved to `k8s/secrets/secrets.yaml`, outside
   `kubectl apply -f k8s/`). Filled-in secrets live only there from now on.
+- 2026-10-17 — App 2.8.0: immersive full screen (switch in the Upload tab, default on). Hides the
+  system bars on the emulator; whether SAIC's own bars on the MG4 can be hidden is only known once
+  tried on the car.
 - 2026-10-17 — App 2.7.1: the voice key works. The car's key report, read off the on-screen log:
   `android.intent.extra.hardkey.keycode` (Integer), `.down` (Boolean, a report per press and per
   release), `.longpress` (Boolean). 2.7.0 looked only for short names and never found the code.
diff --git a/app/build.gradle b/app/build.gradle
index f38b18d..a050f40 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -34,8 +34,8 @@ android {
         applicationId "com.stinnesbeck.nilsmg4"
         minSdk 27
         targetSdk 36
-        versionCode 65
-        versionName "2.7.1"
+        versionCode 66
+        versionName "2.8.0"
 
         // Nothing about the server ships in the APK: its URL and ingest token are entered in
         // the app's Server tab (ServerConfig), and the database is only reachable by the server.
diff --git a/app/src/main/java/com/evsuite/abrp/MainActivity.java b/app/src/main/java/com/evsuite/abrp/MainActivity.java
index fae8d78..44fa0b0 100644
--- a/app/src/main/java/com/evsuite/abrp/MainActivity.java
+++ b/app/src/main/java/com/evsuite/abrp/MainActivity.java
@@ -120,7 +120,7 @@ public class MainActivity extends AppCompatActivity {
     private TextView connectionStatusText;
 
     /** Upload page: live telemetry switch and cadence. */
-    private SwitchMaterial liveTelemetrySwitch, boostSwitch, voiceKeySwitch;
+    private SwitchMaterial liveTelemetrySwitch, boostSwitch, voiceKeySwitch, fullScreenSwitch;
     private TextView steeringKeysText;
     private android.widget.Spinner intervalSpinner;
     private TextInputLayout lowSocLayout;
@@ -308,6 +308,35 @@ public class MainActivity extends AppCompatActivity {
         uiHandler.post(uiRefresh);
     }
 
+    @Override
+    public void onWindowFocusChanged(boolean hasFocus) {
+        super.onWindowFocusChanged(hasFocus);
+        // The system shows its bars again when focus moves (a dialog, the bars swiped in);
+        // re-applying on regaining focus keeps the app full screen.
+        if (hasFocus) applyFullScreen();
+    }
+
+    /**
+     * Immersive full screen: the head unit's top and bottom bars are hidden while the app is
+     * in front, and a swipe from the edge shows them briefly. On the MG4 those bars are SAIC's
+     * own (climate strip, hazard and home shortcuts); if the platform keeps them, these flags
+     * simply have no effect.
+     */
+    @SuppressWarnings("deprecation") // the WindowInsetsController API starts at 30; this is 28
+    private void applyFullScreen() {
+        View decor = getWindow().getDecorView();
+        if (UploadSettings.fullScreen(prefs)) {
+            decor.setSystemUiVisibility(View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
+                    | View.SYSTEM_UI_FLAG_LAYOUT_STABLE
+                    | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
+                    | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
+                    | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
+                    | View.SYSTEM_UI_FLAG_FULLSCREEN);
+        } else {
+            decor.setSystemUiVisibility(View.SYSTEM_UI_FLAG_VISIBLE);
+        }
+    }
+
     @Override
     protected void onPause() {
         super.onPause();
@@ -798,6 +827,12 @@ public class MainActivity extends AppCompatActivity {
         voiceKeySwitch.setChecked(UploadSettings.voiceKeyOpensApp(prefs));
         voiceKeySwitch.setOnCheckedChangeListener((btn, checked) ->
                 prefs.edit().putBoolean(UploadSettings.KEY_VOICE_KEY_OPENS, checked).apply());
+        fullScreenSwitch = servicePane.findViewById(R.id.full_screen_switch);
+        fullScreenSwitch.setChecked(UploadSettings.fullScreen(prefs));
+        fullScreenSwitch.setOnCheckedChangeListener((btn, checked) -> {
+            prefs.edit().putBoolean(UploadSettings.KEY_FULL_SCREEN, checked).apply();
+            applyFullScreen();
+        });
         liveTelemetrySwitch = servicePane.findViewById(R.id.abrp_upload_switch);
         intervalSpinner = servicePane.findViewById(R.id.interval_spinner);
         boostSwitch = servicePane.findViewById(R.id.boost_switch);
diff --git a/app/src/main/java/com/evsuite/abrp/UploadSettings.java b/app/src/main/java/com/evsuite/abrp/UploadSettings.java
index fd3d717..7a867a3 100644
--- a/app/src/main/java/com/evsuite/abrp/UploadSettings.java
+++ b/app/src/main/java/com/evsuite/abrp/UploadSettings.java
@@ -16,6 +16,13 @@ final class UploadSettings {
     static final String KEY_LOW_SOC_PERCENT = "low_soc_percent";
     static final String KEY_AUTOSTART       = "autostart";
     static final String KEY_ABRP_UPLOAD_ENABLED = "abrp_upload_enabled";
+    /** Hide the head unit's system bars while the app is open. */
+    static final String KEY_FULL_SCREEN = "full_screen";
+
+    static boolean fullScreen(SharedPreferences prefs) {
+        return prefs.getBoolean(KEY_FULL_SCREEN, true);
+    }
+
     /** A double press of the steering wheel's voice key opens the app. */
     static final String KEY_VOICE_KEY_OPENS = "voice_key_opens_app";
 
diff --git a/app/src/main/res/layout-w1000dp/pane_service.xml b/app/src/main/res/layout-w1000dp/pane_service.xml
index ea2863f..2ed63fd 100644
--- a/app/src/main/res/layout-w1000dp/pane_service.xml
+++ b/app/src/main/res/layout-w1000dp/pane_service.xml
@@ -6,6 +6,8 @@
             <TextView android:id="@+id/status_text" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="@drawable/bg_input_panel" android:padding="16dp" android:layout_marginTop="20dp" android:layout_marginBottom="12dp" android:text="@string/state_stopped" android:textAppearance="@style/Text.EV.Body" />
             <com.google.android.material.switchmaterial.SwitchMaterial android:id="@+id/abrp_upload_switch" android:layout_width="match_parent" android:layout_height="wrap_content" android:minHeight="72dp" android:text="@string/label_abrp_upload_enabled" android:textAppearance="@style/Text.EV.Body" android:paddingTop="8dp" android:paddingBottom="8dp" app:useMaterialThemeColors="true" app:thumbTint="@color/switch_thumb" app:trackTint="@color/switch_track" android:textColor="@color/ev_text_primary" />
             <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/hint_abrp_upload_enabled" android:textAppearance="@style/Text.EV.Secondary" />
+            <com.google.android.material.switchmaterial.SwitchMaterial android:id="@+id/full_screen_switch" android:layout_width="match_parent" android:layout_height="wrap_content" android:minHeight="72dp" android:text="@string/label_full_screen" android:textAppearance="@style/Text.EV.Body" android:paddingTop="8dp" android:paddingBottom="8dp" app:useMaterialThemeColors="true" app:thumbTint="@color/switch_thumb" app:trackTint="@color/switch_track" android:textColor="@color/ev_text_primary" />
+            <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/hint_full_screen" android:textAppearance="@style/Text.EV.Secondary" />
             <com.google.android.material.switchmaterial.SwitchMaterial android:id="@+id/voice_key_switch" android:layout_width="match_parent" android:layout_height="wrap_content" android:minHeight="72dp" android:text="@string/label_voice_key" android:textAppearance="@style/Text.EV.Body" android:paddingTop="8dp" android:paddingBottom="8dp" app:useMaterialThemeColors="true" app:thumbTint="@color/switch_thumb" app:trackTint="@color/switch_track" android:textColor="@color/ev_text_primary" />
             <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/hint_voice_key" android:textAppearance="@style/Text.EV.Secondary" />
         </LinearLayout>
diff --git a/app/src/main/res/layout/pane_service.xml b/app/src/main/res/layout/pane_service.xml
index b14540c..fbe693c 100644
--- a/app/src/main/res/layout/pane_service.xml
+++ b/app/src/main/res/layout/pane_service.xml
@@ -6,6 +6,8 @@
             <TextView android:id="@+id/status_text" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="@drawable/bg_input_panel" android:padding="16dp" android:layout_marginTop="20dp" android:layout_marginBottom="12dp" android:text="@string/state_stopped" android:textAppearance="@style/Text.EV.Body" />
             <com.google.android.material.switchmaterial.SwitchMaterial android:id="@+id/abrp_upload_switch" android:layout_width="match_parent" android:layout_height="wrap_content" android:minHeight="72dp" android:text="@string/label_abrp_upload_enabled" android:textAppearance="@style/Text.EV.Body" android:paddingTop="8dp" android:paddingBottom="8dp" app:useMaterialThemeColors="true" app:thumbTint="@color/switch_thumb" app:trackTint="@color/switch_track" android:textColor="@color/ev_text_primary" />
             <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/hint_abrp_upload_enabled" android:textAppearance="@style/Text.EV.Secondary" />
+            <com.google.android.material.switchmaterial.SwitchMaterial android:id="@+id/full_screen_switch" android:layout_width="match_parent" android:layout_height="wrap_content" android:minHeight="72dp" android:text="@string/label_full_screen" android:textAppearance="@style/Text.EV.Body" android:paddingTop="8dp" android:paddingBottom="8dp" app:useMaterialThemeColors="true" app:thumbTint="@color/switch_thumb" app:trackTint="@color/switch_track" android:textColor="@color/ev_text_primary" />
+            <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/hint_full_screen" android:textAppearance="@style/Text.EV.Secondary" />
             <com.google.android.material.switchmaterial.SwitchMaterial android:id="@+id/voice_key_switch" android:layout_width="match_parent" android:layout_height="wrap_content" android:minHeight="72dp" android:text="@string/label_voice_key" android:textAppearance="@style/Text.EV.Body" android:paddingTop="8dp" android:paddingBottom="8dp" app:useMaterialThemeColors="true" app:thumbTint="@color/switch_thumb" app:trackTint="@color/switch_track" android:textColor="@color/ev_text_primary" />
             <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/hint_voice_key" android:textAppearance="@style/Text.EV.Secondary" />
         </LinearLayout>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 9f7431d..6d4d5ab 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -107,6 +107,8 @@
     <string name="conn_err_timeout">Connection timed out</string>
     <string name="conn_err_http">Server error (HTTP %1$d)</string>
 
+    <string name="label_full_screen">Full screen</string>
+    <string name="hint_full_screen">Hides the car\'s top and bottom bars while this app is open. Swipe in from the top or bottom edge to show them briefly, e.g. for the climate controls.</string>
     <string name="label_voice_key">Double-press the voice key to open this app</string>
     <string name="hint_voice_key">Press the voice key on the steering wheel twice quickly. The voice assistant may still react to the presses.</string>
     <string name="label_steering_keys">Steering-wheel keys</string>