Configuration pages are used in Dynamics 365 / Power Apps solutions so developers can provide some light documentation on what a solution contains. This might be useful for tracking what is deployed between environments, or what functionality a solution contains.
To use configuration pages, first set up a new solution. Note the Configuration Page only has the option “None”. Let’s click Create to save the solution:

Next, let’s create a new web resource.

Give the web resource a name, and select HTML:

Next, enter your HTML content. I will make a Hello World configuration page:

Now, the web resource is part of our solution:

Let’s go to the Web Resource settings:

And select the HTML page we created as the configuration page:

Now, if we switch over to Classic:

And open the new solution:

On the Configuration tab, we see our HTML page is being displayed:

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This post was very good and Informative, Thanks for sharing @ D365 Master Carl de souza