Available templates depend on the active theme and its configuration. A classic theme may supply named PHP templates, while a block theme can offer editable block templates. A label such as Blank or Full width has theme-specific behaviour, so preview it rather than assuming it means the same thing everywhere.

Record the current template before changing a live page. If the site has custom code or a page builder, check whether it expects a particular template or content container.

1. Open the page editor and find the Template control in the page settings.
2. Choose the intended existing template. Avoid selecting Edit template unless you deliberately want to change the shared template itself.
3. Preview the page with its real content, including forms, galleries and long headings.
4. Save the page when the result is correct, then open its public URL while signed out.

Check whether the page title, header, footer and main content appear once and in the correct order. A blank template may intentionally omit navigation, so make sure visitors still have an appropriate way to continue.

Review mobile width and spacing. A full-width template can expose blocks that were only tested inside a narrow content area. Do not compensate for a wrong template by adding large blank margins to every block.

Return to the editor and confirm the page's blocks still exist. A block template missing its Content block can hide the page body without deleting the stored content. Restore the previous template assignment or repair the template deliberately.

Changing a template used by many pages can affect all of them. If only one page needs a new layout, create and assign an appropriate separate template rather than editing the shared default and discovering the wider impact after publication.

• Creating and assigning a custom block template
• Customising the page template without overwriting content
• Creating a WordPress page with the block editor
• Copying a page layout without duplicating its public URL

• WordPress: Template Editor
• WordPress: Page Post Settings Sidebar