When I activate the GP Premium plugin and click the Home Page Post Read More but

Hi Suban,

That’s WordPress default behavior.

Here’s an article for more information on how to disable this behavior: https://docs.generatepress.com/article/generate_more_jump/

Adding PHP reference: https://docs.generatepress.com/article/adding-php/#code-snippets

Hope this helps!

My suggestion is to add this code to the theme by default

I see, however, we don’t make decisions in the theme to disable a core default functionality of WordPress.

You can read more about this functionality here: https://codex.wordpress.org/Customizing_the_Read_More

This codex page also provides a core method to disable this behavior - we just made that a lot easier with the filter: add_filter( 'generate_more_jump', '__return_false' );

Hope this clarifies!