First, configure the categories: in the admin panel, select the "Catalog" menu. Then, on the left, select the category you want to edit. On the right, the Custom Design tab contains the Page Layout property. If you want all categories to have the same layout, set the page layout of the root category accordingly, and then the child categories - the "Use parent categories" - "True" property.
The layout for all other pages will be determined by the CMS-> Pages page. Click on the page to change, then on the left side select "Design" and then on the right, the "Layout" property.
If you are interested in how to make sure that all subsequently created pages in the CMS administration area use a specific layout by default, so you donβt need to change it every time you create a new content page, Iβm not some, as it seems to me, by default for 1column, although XML seems to set up the page to use a 3-column (I mean, that is in /app/design/frontend///layout/page.xml). I can misunderstand how this is related to this, although perhaps someone can comment. I understand that CMS pages have their layout options and user location information stored in the database. Therefore, perhaps there is another parameter in the database that selects the default value when creating a new CMS page.
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