diff --git a/agent-context/context/skills/mintlify/reference/configuration.md b/agent-context/context/skills/mintlify/reference/configuration.md
index ba1043a62..1bd079386 100644
--- a/agent-context/context/skills/mintlify/reference/configuration.md
+++ b/agent-context/context/skills/mintlify/reference/configuration.md
@@ -450,9 +450,9 @@ Controls whether clicking a navigation group navigates to its first page (`true`
 }
 ```
 
-- `preset`: Layout. `"classic"` (logo top left), `"headline"` (title at the top, logo bottom right), or `"minimal"` (centered text above a logo panel). Omit for the default layout. With a preset, the eyebrow always uses a monospace font.
+- `preset`: Layout. `"classic"` (logo top left), `"headline"` (title at the top, logo bottom right), or `"minimal"` (centered text above a logo panel). Default: `"classic"`, or the original layout when `background` is set without a preset. With a preset, the eyebrow always uses a monospace font.
 - `appearance`: `"light"` or `"dark"`. Default: the site color scheme.
-- `surface`: Background style for preset thumbnails only. `"brand"` (default) tints the background and glow with the primary color hue, or uses `background.color` if set. `"neutral"` uses the site background color with no glow.
+- `surface`: Background style for preset thumbnails, including the default `classic`. `"brand"` (default) tints the background and glow with the primary color hue, or uses `background.color` if set. `"neutral"` uses the site background color with no glow.
 - `background`: Image path or absolute URL. On preset thumbnails, it replaces the `surface` background and glow.
 - `fonts.family` (required with `fonts`): Google Fonts family name, or the name of a self-hosted font. `fonts.source`: URL or path to a self-hosted font file. `fonts.format`: `"woff"`, `"ttf"`, or `"otf"`; required with `source` (`woff2` is not supported). If the font fails to load, thumbnails use the default font.
 - `eyebrow.source`: Navigation level whose name appears above the title: `"group"` (default), `"tab"`, `"dropdown"`, `"anchor"`, `"language"`, `"product"`, `"version"`, `"item"`, or `"none"` to hide it. Falls back to the group name when the page is not inside that level.
diff --git a/organize/settings-appearance.mdx b/organize/settings-appearance.mdx
index 2dfbfa223..9fa79af38 100644
--- a/organize/settings-appearance.mdx
+++ b/organize/settings-appearance.mdx
@@ -342,7 +342,7 @@ Fine-grained visual styling controls.
 Thumbnail customization for social media and page previews.
 
 <ResponseField name="thumbnails.preset" type='"classic" | "headline" | "minimal"'>
-  Layout for thumbnails. If not set, thumbnails use the default layout.
+  Layout for thumbnails. Defaults to `classic`. If you set `thumbnails.background` without a preset, thumbnails keep the original layout with your background image.
 
   - `classic`: Logo in the top left, with the title and description below it.
   - `headline`: Title and description at the top, with the logo in the bottom right.
@@ -356,7 +356,7 @@ Thumbnail customization for social media and page previews.
 </ResponseField>
 
 <ResponseField name="thumbnails.surface" type='"brand" | "neutral"'>
-  Background style for preset thumbnails. Only applies when you set `thumbnails.preset`. Defaults to `brand`.
+  Background style for preset thumbnails, including the default `classic` layout. Defaults to `brand`.
 
   - `brand`: A background and glow tinted with the hue of your primary color. If you set `background.color`, thumbnails use that color as the background.
   - `neutral`: Your site's background color, with no glow.
diff --git a/organize/settings-reference.mdx b/organize/settings-reference.mdx
index ca8175826..9999af883 100644
--- a/organize/settings-reference.mdx
+++ b/organize/settings-reference.mdx
@@ -515,7 +515,7 @@ Social media thumbnail customization.
 Layout for thumbnails: `classic` places the logo in the top left, `headline` places the title at the top and the logo in the bottom right, and `minimal` centers the text above a logo panel. With a preset, the eyebrow always uses a monospace font.
 
 **Type:** `"classic"` | `"headline"` | `"minimal"`
-**Default:** Default layout
+**Default:** `classic`, or the original layout if you set `thumbnails.background` without a preset
 
 #### `thumbnails.appearance`
 
@@ -526,7 +526,7 @@ Visual theme for thumbnails.
 
 #### `thumbnails.surface`
 
-Background style for preset thumbnails. `brand` tints the background and glow with the hue of your primary color, or uses `background.color` if you set it. `neutral` uses your site's background color with no glow. Only applies when you set `thumbnails.preset`.
+Background style for preset thumbnails. `brand` tints the background and glow with the hue of your primary color, or uses `background.color` if you set it. `neutral` uses your site's background color with no glow.
 
 **Type:** `"brand"` | `"neutral"`
 **Default:** `"brand"`