diff --git a/app/src/assets/admin/market.less b/app/src/assets/admin/market.less
index d5d1eec..243f67a 100644
--- a/app/src/assets/admin/market.less
+++ b/app/src/assets/admin/market.less
@@ -18,6 +18,16 @@
       margin-bottom: 0;
     }
   }
+
+  .model-combobox {
+    width: 320px;
+    margin-left: auto;
+
+    @media (max-width: 768px) {
+      width: 100% !important;
+      margin-left: 0 !important;
+    }
+  }
 }
 
 .market-list {
diff --git a/app/src/components/SelectGroup.tsx b/app/src/components/SelectGroup.tsx
index 778aebe..95e6ce4 100644
--- a/app/src/components/SelectGroup.tsx
+++ b/app/src/components/SelectGroup.tsx
@@ -105,7 +105,7 @@ function SelectGroupMobile(props: SelectGroupProps) {
   return (
     <div className={`mb-2 w-full`}>
       <Select
-        value={props.current.name}
+        value={props.current.name || ""}
         onValueChange={(value: string) => {
           props.onChange?.(value);
         }}
diff --git a/app/src/routes/admin/Market.tsx b/app/src/routes/admin/Market.tsx
index 2befad0..7ba2f72 100644
--- a/app/src/routes/admin/Market.tsx
+++ b/app/src/routes/admin/Market.tsx
@@ -472,7 +472,7 @@ function Market() {
                                     payload: { idx: index, id },
                                   });
                                 }}
-                                className={`ml-auto`}
+                                className={`model-combobox`}
                                 list={channelModels}
                                 placeholder={t(
                                   "admin.market.model-id-placeholder",