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Splitting the builder into a preview column and a fields column still capped the mockup at half the dialog's width. Give it the full width of the modal instead (name field on top, preview below spanning the whole dialog, fields and the native-controls toggle underneath), and scale up CustomThemePreview's own fixed pixel dimensions (~1.4x: avatar, sidebar, paddings, font sizes) so the extra room reads as a genuinely bigger mockup rather than the same small one with more empty space around it. Modal width bumped from 820px to 960px to match. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>