Edit location and color of custom blocks in Admin

Hi,

You can create a custom block category, move it to the top and assign the block to that category. Refer to this documentation https://developer.wordpress.org/reference/hooks/block_categories_all/
https://stackoverflow.com/questions/54185278/how-to-list-and-re-arrange-or-manipulate-gutenberg-block-categories-in-wordpress

function wpdocs_add_new_block_category( $block_categories, $block_editor_context ) {
    $custom_category = [
        'slug'  => 'my-block-category',
        'title' => esc_html__( 'My Block Category', 'text-domain' ),
        'icon'  => 'wordpress', // Slug of a WordPress Dashicon or custom SVG
    ];
    $block_categories[0] = $custom_category;
    return $block_categories;
}
add_filter( 'block_categories_all', 'wpdocs_add_new_block_category', 10, 2 );