diff --git a/apps/desktop/src/app/chat/right-rail/preview-file.tsx b/apps/desktop/src/app/chat/right-rail/preview-file.tsx
index e3ebc4f2285f..30cd4a85682b 100644
--- a/apps/desktop/src/app/chat/right-rail/preview-file.tsx
+++ b/apps/desktop/src/app/chat/right-rail/preview-file.tsx
@@ -288,7 +288,7 @@ const MARKDOWN_COMPONENTS = {
 
 function MarkdownPreview({ text }: { text: string }) {
   return (
-    <div className="preview-markdown mx-auto max-w-3xl px-4 py-3 text-sm text-foreground">
+    <div className="preview-markdown mx-auto max-w-none px-4 py-3 text-sm text-foreground">
       <Streamdown components={MARKDOWN_COMPONENTS} controls={false} mode="static" parseIncompleteMarkdown={false}>
         {text}
       </Streamdown>
diff --git a/apps/desktop/src/app/chat/right-rail/preview.tsx b/apps/desktop/src/app/chat/right-rail/preview.tsx
index dec0e36f47be..abe82c034af2 100644
--- a/apps/desktop/src/app/chat/right-rail/preview.tsx
+++ b/apps/desktop/src/app/chat/right-rail/preview.tsx
@@ -24,9 +24,9 @@ import {
 import { PreviewPane } from './preview-pane'
 
 export const PREVIEW_RAIL_MIN_WIDTH = '18rem'
-export const PREVIEW_RAIL_MAX_WIDTH = '38rem'
+export const PREVIEW_RAIL_MAX_WIDTH = '72rem'
 
-const INTRINSIC = `clamp(${PREVIEW_RAIL_MIN_WIDTH}, 36vw, 32rem)`
+const INTRINSIC = `clamp(${PREVIEW_RAIL_MIN_WIDTH}, 36vw, 64rem)`
 
 // Track for <Pane id="preview">. Folds the intrinsic clamp with a min-floor
 // against --chat-min-width so the chat surface never gets squeezed below it.