Theme-Config tab in admin Pannel?

  1. It’s not classified as plugins. It’s also not a WordPress glossary and often called: Tabs which are built on Settings API and some tricks with $_GET request.

  2. There’re many Q&As, references you can learn from. This topic seems to be the most relevant one for you.

  3. Yes, you can do it with template_include filter. These Q&As may be helpful too.

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