Remove “#comments” from comments pagination url

Somewhere in your theme template is a call to the_comments_pagination(). If you would look at the source code, you could find the declaration of that function:

function the_comments_pagination( $args = array() ) {
    echo get_the_comments_pagination( $args );
}

There are two things to note here:

1. This function is passing its call through to another function.
2. It accepts a parameter $args.

Looking at the called function get_the_comments_pagination() shows you that the markup is built using paginate_comments_links( $args ). So the $args are passed through again.

And in that function you can see what happens with the parameter: It is parsed against a default value.

    'base' => add_query_arg( 'cpage', '%#%' ),
    'format' => '',
    'total' => $max_page,
    'current' => $page,
    'echo' => true,
    'add_fragment' => '#comments'

In conclusion, you just have to change the call to the first function:

the_comments_pagination([ 'add_fragment' => '' ]);