diff --git a/components/ai-cad/ai-cad-workbench.tsx b/components/ai-cad/ai-cad-workbench.tsx
index 9d3d54da7..41247cce8 100644
--- a/components/ai-cad/ai-cad-workbench.tsx
+++ b/components/ai-cad/ai-cad-workbench.tsx
@@ -4494,7 +4494,7 @@ export function AiCadWorkbench() {
 
             <div className="min-h-0 flex-1 overflow-hidden bg-white">
               <PanelGroup
-                autoSaveId={`ai-cad-panel-layout:${panelDirection}`}
+                autoSaveId={`ai-cad-panel-layout:v2:${panelDirection}`}
                 className="flex h-full min-h-0"
                 direction={panelDirection}
               >
@@ -4502,8 +4502,8 @@ export function AiCadWorkbench() {
                   className="order-5 min-h-0"
                   collapsedSize={panelDirection === "horizontal" ? 8 : 12}
                   collapsible
-                  defaultSize={panelDirection === "horizontal" ? 34 : 29}
-                  minSize={panelDirection === "horizontal" ? 28 : 22}
+                  defaultSize={panelDirection === "horizontal" ? 39 : 29}
+                  minSize={panelDirection === "horizontal" ? 32 : 22}
                   onCollapse={() => setIsConversationPanelCollapsed(true)}
                   onExpand={() => setIsConversationPanelCollapsed(false)}
                   order={3}
@@ -4722,7 +4722,7 @@ export function AiCadWorkbench() {
                   className="order-1 min-h-0"
                   collapsedSize={panelDirection === "horizontal" ? 0 : 12}
                   collapsible
-                  defaultSize={18}
+                  defaultSize={panelDirection === "horizontal" ? 14 : 18}
                   minSize={panelDirection === "horizontal" ? 14 : 18}
                   onCollapse={() => setIsHistoryPanelCollapsed(true)}
                   onExpand={() => setIsHistoryPanelCollapsed(false)}
@@ -5521,7 +5521,7 @@ export function AiCadWorkbench() {
                   className="order-3 min-h-0"
                   collapsedSize={panelDirection === "horizontal" ? 11 : 12}
                   collapsible
-                  defaultSize={52}
+                  defaultSize={panelDirection === "horizontal" ? 47 : 52}
                   minSize={panelDirection === "horizontal" ? 34 : 22}
                   onCollapse={() => setIsResultPanelCollapsed(true)}
                   onExpand={() => setIsResultPanelCollapsed(false)}