homepage

It is a bit beyond what I can assist with, but I can give some pointers.

Create a new page template, and where you want to show the featured posts, try adding something like this:

<?php get_template_part('inc/featured'); ?>

Then you also need to edit /inc/featured.php, remove line 15 and 30 entirely. These two:

<?php if ( is_home() && !is_paged() && ( get_theme_mod('featured-posts-count','3') !='0') && $featured->have_posts() ): // Show if posts are not 0 ?>

and

<?php endif; ?>

This should make the featured posts appear, but I can’t guarantee that it will work.

Hmm, see this:

https://developer.wordpress.org/themes/template-files-section/page-template-files/#creating-custom-page-templates-for-global-use

I think using page.php in the theme as base for your page template could be a good move.

If you have it set as a page template for the homepage, it should only appear on the homepage. Did you edit page.php by any chance? That is wrong. If so, it will appear on all pages.

You need to create a new php file, name it frontpage.php for example, with the page code I gave above. Then select the template for the frontpage like this:
https://s3.amazonaws.com/helpscout.net/docs/assets/55192029e4b0221aadf23f55/images/60e6f7d48556b07a2884da74/file-mtqt0byV77.png

If you have a FTP-client like FileZilla, you can just copy or download /wp-content/themes/shapebox/page.php, rename it and upload frontpage.php.