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# layout-groups Definition **Definition:** Parentheses-named directories `(group)` organize routes under separate layout hierarchies without affecting the URL pathname. **Syntax:** `src/routes/(app)/...` and `src/routes/(marketing)/...` **Returns:** Layouts inside a group apply only to routes in that group. ## Example ```txt src/routes/ ├ (app)/ │ ├ dashboard/ │ ├ item/ │ └ +layout.svelte ├ (marketing)/ │ ├ about/ │ ├ testimonials/ │ └ +layout.svelte └ +layout.svelte ``` ## Related - `page-reset-layout`, `layout-reset`, `advanced-routing`