[mintlify]

Documents that thumbnails.preset now defaults to classic, and that sites with a thumbnails.background image and no preset keep the original layout.

The settings pages said an unset preset used "the default layout" and that thumbnails.surface only applied with an explicit preset. Both statements are now wrong, because classic is the default.

Based on feat(og): make Classic the default thumbnail layout, which changed the default thumbnail layout and the dashboard setting description.

Duplicate check: open and recently merged docs PRs (thumbnail, preset, social preview), open Autopilot PRs, and the author's docs PRs. None cover this.

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Note

Low Risk
Documentation-only updates to thumbnail settings; no runtime or config schema changes in this repo.

Overview
Updates Mintlify docs so thumbnails.preset and thumbnails.surface match the product change that makes Classic the default OG/thumbnail layout.

thumbnails.preset is now documented as defaulting to classic, with a carve-out: if you set thumbnails.background without a preset, thumbnails keep the original (pre-classic-default) layout. thumbnails.surface is no longer described as requiring an explicit preset—it applies to preset thumbnails including the default classic layout.

The same wording updates appear in the agent configuration reference (configuration.md), Appearance and branding (settings-appearance.mdx), and the docs.json schema reference (settings-reference.mdx).

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Project	Status	Preview	Updated
Mintlify Docs	🔴 Failed	–	Oct 21, 2026, 10:32 PM