cx-newsletter/views/1-config_panel_view.php

<?php

namespace cx_newsletter;

class config_panel_view 
extends view
implements view_interface {
    public function connect() : void {
        \add_options_page(
            'cx-newsletter',
            'cx-newsletter',
            'manage_options',
            'cx_newsletter_control_panel',
            [$this, 'action'],
        );
    }

    public function process() : void {
        $this->add_activity(config_panel_activity::get_name());
    }
}