Contact Form 7 Code field not displaying

To use CAPTCHA, you need GD and FreeType library installed on your server.

Also, make sure that CAPTCHA’s temporary folder is writable. Contact Form 7 refers your upload folder setting in Settings > Miscellaneous menu for resolving the base directory for CAPTCHA’s temporary folder. For example, when your upload folder is set “wp-content/myfiles”, CAPTCHA temp files will be created in wp-content/myfiles/wpcf7_captcha, so you need to make that folder writable.

Ref.
https://contactform7.com/faq/#CAPTCHA_does_not_work_the_image_does_not_show_up

Also, To use CAPTCHA, you need Really Simple CAPTCHA plugin installed.

Plugin:
https://www.ads-software.com/extend/plugins/really-simple-captcha/

Also, make sure that the following code is inserted above your submit button in the Contact Form 7 settings FORM.

[captchac your-captcha]
<label>Enter the code: [captchar your-captcha]</label>

You can see my working form on my contact page on my website.

https://moneysitemarketing.com/