Hello @iamwithU,
Thanks for writing to us.
I checked your Themeco account dashboard it seems that you have a Pro theme license and you are using the Pro theme. Please note we have two themes one is the X theme and another one is the Pro theme. Pro theme has more advanced features than the X theme such as Header/Footer builder and Layout builder. You can use Pro Header/Footer builder to create a custom Header/Footer for the page, posts, archive page, etc. You can create a custom layout for blog pages, category archive pages, and tag archive pages. You can also create custom layouts for the WooCommerce shop page, Product archive page, and Product details page as well.
https://theme.co/docs/layout-builder-overview
https://theme.co/docs/header-builder-overview
https://theme.co/docs/footer-builder-overview
In the X theme, you need to install the Cornerstone page builder plugin separately from the X theme bundled plugin whereas in the Pro theme you don’t need to install the Cornerstone page builder separately. The Cornerstone page builder plugin is inbuilt with the Pro theme.
You may check out our doc to learn more about the difference between X and Pro themes.
https://theme.co/docs/the-difference-between-x-pro
For the naming, after the update of the Pro theme, your dashboard would look like this, there would Pro menu and a Cornerstone menu. Please have a look at the given screenshot below.

In the last major release, we separated the Pro and the Cornerstone, which were previously integrated within the theme. Now you can find the Validation and other Bundled plugin settings under the Pro menu and builder-related options under the Cornerstone menu.
You can find more details in the following articles.
https://www.facebook.com/yourthemeco/posts/4029224620507666
Thanks