CloudFlare enabled but test fail

@ionutn thanks for the answer.
I tried again to delete the wp- from the field in the cache tab, Bypass Page cache when these cookies are present in the request packet. If I remove from there I get WordPress fatal error when saving and WordPress send me an email saying your plugin generated a fatal error.

Am I removing the wp- string in the wrong place?

I see the WordPress saying in my language, Italian that a fatal error occur and an email is sent by WordPress to login back to WordPress in the case your plugin broke all WordPress access. Fortunately I still be able to navigate my website and the string is not removed. It cause a fatal WordPress error. Just WordPress show me the string that alert a fatal error has been generated and I get the email to resume WordPress. The string that I remove are not removed.

Sure I use latest version.

Thank you for your time and sorry for taking your time.
I appreciate your reply.

In the WordPress email is just specified an error has been occur from your plugin.
I looked into WordPress error log and found:

PHP Fatal error:  Uncaught Error: Call to undefined function opcache_get_status() in /wp-content/plugins/wp-cloudflare-page-cache/libs/cache_controller.class.php:3029

#0 /wp-content/plugins/wp-cloudflare-page-cache/libs/cache_controller.class.php(824): SWCFPC_Cache_Controller->purge_opcache()
#1 /wp-content/plugins/wp-cloudflare-page-cache/libs/cache_controller.class.php(2349): SWCFPC_Cache_Controller->purge_urls()
#2 /wp-includes/class-wp-hook.php(324): SWCFPC_Cache_Controller->ajax_purge_single_post_cache()
#3 /wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters()
#4 /wp-includes/plugin.php(517): WP_Hook->do_action()
#5 /wp-admin/admin-ajax.php(192): do_action()
#6 {main}
  thrown in /wp-content/plugins/wp-cloudflare-page-cache/libs/cache_controller.class.php on line 3029

#0   /wp-content/plugins/wp-cloudflare-page-cache/libs/cache_controller.class.php(730): SWCFPC_Cache_Controller->purge_opcache()
#1   /wp-content/plugins/wp-cloudflare-page-cache/src/Modules/Settings_Manager.php(175): SWCFPC_Cache_Controller->purge_all()
#2   /wp-includes/class-wp-hook.php(324): SPC\Modules\Settings_Manager->update_additional_settings()
#3   /wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters()
#4   /wp-includes/plugin.php(517): WP_Hook->do_action()
#5   /wp-content/plugins/wp-cloudflare-page-cache/libs/backend.class.php(1091): do_action()
#6   /wp-includes/class-wp-hook.php(324): SWCFPC_Backend->admin_menu_page_index()
#7   /wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters()
#8   /wp-includes/plugin.php(517): WP_Hook->do_action()
#9   /wp-admin/admin.php(259): do_action()
#10   /wp-admin/options-general.php(10): require_once('...')

@kushnamdev I gave up using Cloudflare with your plugin, it doesn’t work.
End of the story.