There are two areas to custom options for Service page and Single post page are Theme option and Custom setting for Service which located in Theme option ==> Child Options such as Header, Footer, Layout, Page Title, Color, Typography
Any option is set to Default which is the current style of your Theme Option . So, if you want same settings on all pages, then you don't need to select anything. If you want a different option for Single post page or Service page, then you can choose any other option here as your wish.
You can view the area (1) in bellow image:
If you want a different settings for a page, then you can setup options in Custom setting for Service and apply it to that specific pages: Single Product and Shop
.jpg)
This is options in Page setting