Cannot set Default Captcha in Global Configuration

-- HikaShop version -- : 3.5.0
-- Joomla version -- : 3.8.10
-- PHP version -- : 7.0.30
-- Browser(s) name and version -- : Safari, google, Firefox latest
-- Error-message(debug-mod must be tuned on) -- : No error from debug

We are about to start using Hikashop for customers.

1 - On a test site we noticed after installing Hikashop Essentials there is a Hikashop Captcha plugin but the Joomla supplied plugin is no longer there. Is this normal that Hikashop installs its own captcha plugin and removes the default Joomla plugin?

2 - The "Default Captcha" box in the global configuration is now greyed out and we can't select a default captcha. Is this normal? Any ideas what would cause this if this is not normal? Can you suggest how to fix this?

Thanks in advance.

Thank you.

The problem was for some reason the default joomla captcha plugin was listed as not installed properly. We had subsequently put the Captcha the Hikashop folks on. So found a way in Joomla to reinstall the Joomla one and all fixed now.

Thanks for your help.