Hi, carroninsurance.
The default layouts for the different areas of your website (aka “contexts”) are set in Appearance > Layout Manager > Layouts underneath the “Defaults” heading.
About default layouts
The layouts you set in the layout manager (Appearance > Layout Manager > Layouts) are the defaults that will be used unless you set set an override for an individual article. The individual article overrides enable you to optionally override the header, the body, and/or the footer used in the default layout set for that type of article.
Your website’s home page will use by default whatever layout you set in the layout manager for the Home Page context.
Articles that are of the WordPress “page” post type will use by default whatever layout you set in the layout manager for the Page context.
Articles that are of the WordPress “post” post type will use by default whatever layout you set in the layout manager for the Single Post context.
WordPress “archive” pages that are dynamically created by WordPress, such as lists of posts by certain authors for example, will use by default whatever layout you set in the layout manager for the Blog context.
Search results pages will use by default whatever layout you set in the layout manager for the Search context.
Your 404 Error page will use by default whatever layout you set in the layout manager for the Error context.
If the type of page being displayed does not have its own default layout set, then it will use whatever layout you set in the layout manager for the Default layout – i.e. this Default layout setting is the fallback position “if all else fails”.
Underneath the “Registered Templates” heading you will find a list of additional areas that may have a default layout assigned to them. For example, we have added WordPress categories to this list, thus enabling you set a different layout for every different category archive page if you want to. (If you don’t set these to defaults then these WordPress category archive pages will use the layout set for the Blog context just like all other WordPress archive pages).
Underneath the “Custom Post Types (auto generated)” heading you will find a further list of additional areas that may have a default layout assigned to them. If a plugin creates a custom post type, this is the list to look in to set default layouts for the plugin’s specialised pages (if it has any). Here also you will find listed the Portfolio custom post type that is set up by the Vellum theme, this enabling you to set a default layout for articles that are of the “portfolio” post type.
The usual use of layouts is to set the defaults here in the layout manager for each different context and then use the individual article overrides only if you want a particular article to use a different layout than the one set as the default for that type of article.
I hope the above has helped you to understand how layouts work. If not, please let me know and I’ll have another go.