To add a CTA block, drag and drop Emprise CTA block on your page. Once done, you will see following controls as shown in the screenshot below:
You can add/edit entire CTA block with custom properties, including background and also chose to display/hide the button, or link it to external page to open in new tab etc. Please note that sometimes, show/hide may not update in the elementor live preview but it will still show and work in the frontend.