diff --git a/src/request_tab_widget.py b/src/request_tab_widget.py
index f5b1522..52d0abc 100644
--- a/src/request_tab_widget.py
+++ b/src/request_tab_widget.py
@@ -41,6 +41,7 @@ class RequestTabWidget(Gtk.Box):
         self.selected_environment_id = selected_environment_id
         self.project_manager = None  # Will be injected from window
         self.environment_dropdown = None  # Will be created if project_id is set
+        self.env_separator = None  # Visual separator after environment dropdown
         self.undefined_variables = set()  # Track undefined variables for visual feedback
         self._update_indicators_timeout_id = None  # Debounce timer for indicator updates
 
@@ -57,17 +58,26 @@ class RequestTabWidget(Gtk.Box):
     def _build_ui(self):
         """Build the complete UI for this tab."""
 
-        # URL Input Section
-        url_clamp = Adw.Clamp(maximum_size=1000)
-        self.url_box = Gtk.Box(orientation=Gtk.Orientation.HORIZONTAL, spacing=12)
-        self.url_box.set_margin_start(12)
-        self.url_box.set_margin_end(12)
-        self.url_box.set_margin_top(12)
-        self.url_box.set_margin_bottom(12)
+        # URL Input Section - outer container (store as instance var for dynamic updates)
+        self.url_container = Gtk.Box(orientation=Gtk.Orientation.HORIZONTAL, spacing=0)
+        self.url_container.set_margin_start(12)
+        self.url_container.set_margin_end(12)
+        self.url_container.set_margin_top(12)
+        self.url_container.set_margin_bottom(12)
 
-        # Environment Selector (only if project_id is set, added first)
+        # Environment Selector (left-aligned, outside clamp)
         if self.project_id:
-            self._build_environment_selector()
+            self._build_environment_selector_inline(self.url_container)
+            # Add visual separator/spacer after environment
+            self.env_separator = Gtk.Separator(orientation=Gtk.Orientation.VERTICAL)
+            self.env_separator.set_margin_start(12)
+            self.env_separator.set_margin_end(12)
+            self.url_container.append(self.env_separator)
+
+        # URL bar (method, URL, send) - centered in clamp
+        url_clamp = Adw.Clamp(maximum_size=1000)
+        url_clamp.set_hexpand(True)
+        self.url_box = Gtk.Box(orientation=Gtk.Orientation.HORIZONTAL, spacing=12)
 
         # Method Dropdown
         self.method_dropdown = Gtk.DropDown()
@@ -91,7 +101,8 @@ class RequestTabWidget(Gtk.Box):
         self.url_box.append(self.send_button)
 
         url_clamp.set_child(self.url_box)
-        self.append(url_clamp)
+        self.url_container.append(url_clamp)
+        self.append(self.url_container)
 
         # Vertical Paned: Main Content | History Panel
         vpane = Gtk.Paned(orientation=Gtk.Orientation.VERTICAL)
@@ -592,9 +603,9 @@ class RequestTabWidget(Gtk.Box):
 
         return body
 
-    def _build_environment_selector(self):
-        """Build environment selector and add to URL box."""
-        if not self.project_id or not hasattr(self, 'url_box'):
+    def _build_environment_selector_inline(self, container):
+        """Build environment selector and add to container."""
+        if not self.project_id:
             return
 
         # Create dropdown (compact, no label)
@@ -605,8 +616,8 @@ class RequestTabWidget(Gtk.Box):
         # Connect signal
         self.environment_dropdown.connect("notify::selected", self._on_environment_changed)
 
-        # Add to URL box at the start (before method dropdown)
-        self.url_box.prepend(self.environment_dropdown)
+        # Add to container
+        container.append(self.environment_dropdown)
 
         # Populate if project_manager is already available
         if self.project_manager:
@@ -660,12 +671,22 @@ class RequestTabWidget(Gtk.Box):
         if self.environment_dropdown:
             return
 
-        # Create and add the selector to URL box
-        self._build_environment_selector()
+        # Create and add the selector to URL container
+        if hasattr(self, 'url_container'):
+            self._build_environment_selector_inline(self.url_container)
 
-        # Populate if project_manager is available
-        if self.project_manager:
-            self._populate_environment_dropdown()
+            # Add separator after environment dropdown (insert before the url_clamp)
+            self.env_separator = Gtk.Separator(orientation=Gtk.Orientation.VERTICAL)
+            self.env_separator.set_margin_start(12)
+            self.env_separator.set_margin_end(12)
+            # Insert separator as second child (after environment dropdown)
+            first_child = self.url_container.get_first_child()
+            if first_child:
+                self.url_container.insert_child_after(self.env_separator, first_child)
+
+            # Populate if project_manager is available
+            if self.project_manager:
+                self._populate_environment_dropdown()
 
     def _on_environment_changed(self, dropdown, _param):
         """Handle environment selection change."""