diff --git a/controller/cuda_grid_controller/config.py b/controller/cuda_grid_controller/config.py
index a322c60..4fe60ff 100644
--- a/controller/cuda_grid_controller/config.py
+++ b/controller/cuda_grid_controller/config.py
@@ -101,6 +101,10 @@ class InstanceCfg(BaseModel):
         default="streamselect@main_cam",
         description="ZMQ target streamselect filter для dynamic main camera (single layout)",
     )
+    mpp_main_filter_target: str = Field(
+        default="streamselect@mpp_main",
+        description="ZMQ target streamselect filter для dynamic main в main_plus_preview layout",
+    )
     layout_map: dict[str, int] = Field(
         default_factory=lambda: {"quad": 0, "single": 1, "main_plus_preview": 2},
         description="layout name → streamselect map index (соответствует pipeline filter_complex)",
diff --git a/controller/cuda_grid_controller/dispatch.py b/controller/cuda_grid_controller/dispatch.py
index 8d58890..81d386f 100644
--- a/controller/cuda_grid_controller/dispatch.py
+++ b/controller/cuda_grid_controller/dispatch.py
@@ -196,6 +196,20 @@ class CommandDispatcher:
         except (TimeoutError, Exception) as e:
             log.warning("dispatch.main_cam_fail", instance=instance, error=str(e))
 
+    async def set_mpp_main(self, instance: str, cam_index: int) -> None:
+        """Switch mpp main camera через streamselect@mpp_main map."""
+        inst = self._find_instance(instance)
+        if inst is None:
+            return
+        client = self._client(inst)
+        try:
+            reply = await client.send_command(
+                inst.mpp_main_filter_target, "map", str(cam_index)
+            )
+            log.info("dispatch.mpp_main_set", instance=instance, cam_index=cam_index, ffmpeg_reply=reply)
+        except (TimeoutError, Exception) as e:
+            log.warning("dispatch.mpp_main_fail", instance=instance, error=str(e))
+
     async def _reload_icon(self, instance: str, icon_name: str) -> None:
         """Invalidate cached icon atlas в filter — used by DynamicRenderer."""
         inst = self._find_instance(instance)
diff --git a/controller/cuda_grid_controller/frigate_bridge.py b/controller/cuda_grid_controller/frigate_bridge.py
index bb035d7..77ab32b 100644
--- a/controller/cuda_grid_controller/frigate_bridge.py
+++ b/controller/cuda_grid_controller/frigate_bridge.py
@@ -213,13 +213,19 @@ class FrigateBridge:
         ]
         active.sort(key=lambda m: -m.priority)
 
+        # Auto-layout logic v2:
+        #   0 active     → quad (overview)
+        #   1 active     → single, main_cam = тот один
+        #   2+ active    → main_plus_preview, main_cam = highest priority active
         if not active:
-            # Idle — quad
             target_layout = "quad"
             target_main_cam = 0
-        else:
+        elif len(active) == 1:
             target_layout = "single"
             target_main_cam = active[0].main_cam_index
+        else:
+            target_layout = "main_plus_preview"
+            target_main_cam = active[0].main_cam_index  # highest priority
 
         prev = self._auto_state.get(instance, (None, None))
         if prev == (target_layout, target_main_cam):
@@ -227,8 +233,9 @@ class FrigateBridge:
         log.info("auto_layout.change", instance=instance,
                  from_state=prev, to_layout=target_layout, to_main=target_main_cam,
                  active=[m.frigate_camera for m in active])
-        # Set main_cam first (so single layout shows correct cam at switch moment)
+        # Set both main_cam streamselects (single и mpp независимые)
         await self.dispatcher.set_main_cam(instance, target_main_cam)
+        await self.dispatcher.set_mpp_main(instance, target_main_cam)
         await self.dispatcher.handle(instance, "layout.set", target_layout)
         self._auto_state[instance] = (target_layout, target_main_cam)