What is the difference between the Customizer and the Site Editor?

The Customizer is used mainly by classic themes, while the Site Editor is used by block themes. The Customizer provides theme-specific controls and a live preview; the Site Editor lets you edit global styles, templates, template parts and navigation with blocks. If Appearance > Customize is missing, check Appearance > Editor instead.

Why cannot I see the option to change my header or footer?

Your theme may not expose header and footer controls, or you may be using the wrong editing screen. Block themes manage these areas through Appearance > Editor and template parts, while classic themes depend on Customizer and theme-specific settings. If neither screen provides the option, you need a compatible visual tool, page builder or developer change.

Will my design changes disappear after a theme update?

Changes made through the Customizer or Site Editor are generally stored as site settings or database changes, but edits made directly inside theme files can be overwritten by an update. Export Site Editor changes where available, keep a backup and avoid editing the parent theme. Use a child theme for code-level customisations that must remain separate from the parent theme.

Do I need a plugin to customise a WordPress design?

No, you do not usually need a plugin for basic design changes. WordPress can handle colours, typography, spacing, templates and many layout changes through the Customizer or Site Editor. You need an additional tool when your theme lacks the required controls, or when you want a visual interface for more detailed headers, footers, layouts and branding without writing code.

How to customize the design of a WordPress site

Design & Layout Time About 30–60 minutes 6 steps Updated 12 Sep 2026

The short answer

You can customise a WordPress design without coding by using Appearance > Editor with a block theme, or Appearance > Customize with a classic theme. Use the built-in controls first; add custom CSS or a visual design tool only when your theme does not expose the layout or styling option you need.

The route

01Check which editor you have
02Set your global styles
03Edit the header and footer
04Adjust page layouts
05Add only necessary CSS
06Use a visual design tool

What you need

Administrator access to the WordPress dashboard
A current backup or staging copy of the site
Your logo, brand colours and preferred fonts
A theme that supports the design changes you want

Check which editor you have

Open the WordPress dashboard and look under Appearance. If you see Editor, your active theme is a block theme and you can change global styles, templates, headers and footers there. If you see Customize, you are using a classic theme with the Customizer. The available controls depend on the active theme.

Do not switch themes just to find a setting before making a backup. A theme change can affect menus, widgets, templates and page layouts.

Set your global styles

With a block theme, go to Appearance > Editor > Styles. Set the site-wide colours, typography and layout first, then adjust individual block types under the block styling options. These settings affect the whole site, so changing a heading style can alter headings across posts and pages.

With a classic theme, open Appearance > Customize and work through the options provided by the theme, such as colours, background, site identity and layout settings. Use the preview and device controls before publishing.

Edit the header and footer

In a block theme, open Appearance > Editor, then edit the header and footer from the template parts or patterns area. Add or rearrange blocks such as the site logo, navigation, search and social links, then save the changes.

In a classic theme, header and footer controls may appear in the Customizer, under widgets, menus or a theme-specific options panel. If the theme does not provide those controls, changing the files directly is a development task rather than a safe dashboard setting.

Adjust page layouts

For a block theme, use Appearance > Editor > Templates to edit layouts for the homepage, pages, posts, archives, search results and the 404 page. A template change applies to every page or post using that template, so check the template name before removing or moving a block.

For a classic theme, use the page editor, theme layout options or a page builder if the theme supports one. A page-level change usually affects only that page, while a template or theme setting can affect the entire site.

Add only necessary CSS

Use the Customizer's Additional CSS area when your classic theme provides it, rather than editing the theme's files. WordPress previews the CSS before you publish it, which makes this suitable for small changes such as spacing, borders or a minor colour adjustment.

Keep a copy of every rule you add and test desktop, tablet and mobile views. CSS selectors can stop working after a theme redesign, and direct edits to a parent theme can be lost when that theme updates. Use a child theme or a maintained customisation method for larger code changes.

Use a visual design tool

If the built-in Customizer or Site Editor does not provide enough control, a visual theme tool such as Citadela Pro can add Customizer-based controls for fonts, colours, headers, footers and layouts without requiring you to write CSS. This is the faster route when you need a consistent visual system across the site rather than a few isolated tweaks.

Before activating it, check whether it is intended to work with your current theme, take a backup and review its settings on a staging copy. Save the design, then check the homepage, menus, forms, shop pages and mobile layout before making it live.

The fast route

Let Citadela Pro do it

Customizer-based control over fonts, colors, headers, footers, and layouts for users who want visual changes without coding.

Get Citadela Pro

Sources

wordpress.org /documentation/article/site-editor/?utm_source=openai
wordpress.org /documentation/article/customizer/?utm_source=openai
wordpress.org /documentation/article/template-editor/?utm_source=openai
developer.wordpress.org /advanced-administration/wordpress/css/?utm_source=openai

Questions

What is the difference between the Customizer and the Site Editor?: The Customizer is used mainly by classic themes, while the Site Editor is used by block themes. The Customizer provides theme-specific controls and a live preview; the Site Editor lets you edit global styles, templates, template parts and navigation with blocks. If Appearance > Customize is missing, check Appearance > Editor instead.
Why cannot I see the option to change my header or footer?: Your theme may not expose header and footer controls, or you may be using the wrong editing screen. Block themes manage these areas through Appearance > Editor and template parts, while classic themes depend on Customizer and theme-specific settings. If neither screen provides the option, you need a compatible visual tool, page builder or developer change.
Will my design changes disappear after a theme update?: Changes made through the Customizer or Site Editor are generally stored as site settings or database changes, but edits made directly inside theme files can be overwritten by an update. Export Site Editor changes where available, keep a backup and avoid editing the parent theme. Use a child theme for code-level customisations that must remain separate from the parent theme.
Do I need a plugin to customise a WordPress design?: No, you do not usually need a plugin for basic design changes. WordPress can handle colours, typography, spacing, templates and many layout changes through the Customizer or Site Editor. You need an additional tool when your theme lacks the required controls, or when you want a visual interface for more detailed headers, footers, layouts and branding without writing code.