Metronic Demo 1 comes with 4 main layout options:

Dark Sidebar:
- In "App.razor" set "Layout.DefaultDarkSidebar" as default layout template.

Light Sidebar:
- In "App.razor" set "Layout.DefaultLightSidebar" as default layout template.

Dark Header:
- In "App.razor" set "Layout.DefaultDarkHeader" as default layout template.

Light Header:
- In "App.razor" set "Layout.DefaultLightHeader" as default layout template.