Can't change article style on menu item

Hello,
I have a menu item as magazine layout and under blog layout options the option article style is not working at all when i press the button

Thank you for contacting us.
Can you check the admin tool login? I tried the account you provided but it does not work.

Best regards.

Manit hello i upgraded the credentials please try again

Somehow, there is a new class called monochrome loaded on this page of your site which has filter so you did not see the modal popup.

I added custom css into this file of your site so the modal can work fine now: /media/templates/administrator/atum/css/user.css

body.admin.com_menus.view-item.layout-edit.task-display.monochrome.modal-open {
    filter: none;
}

Kindly check.

Thanks for the fix.
Please keep in mind that this monochrome class is part of joomla administrators template color settings.
Regards