Hi Pieter,

Thank you for your message.

The icon library within the theme comes from the "Font Awesome" icon library and just recently they've added the "X" icon as addition to the Twitter icon.

I have added it on our to-do-list and we will update the font library within the theme for the following theme update.

If you would like to show an "X" icon right now I can only provide a CSS workaround by going through the following steps below:

1. Click on the attached image below my message and save the "X" icon image
2. Upload this image to your website under the "Media" tab
3. After the image is uploaded click on the thumbnail and within the modal copy the link to the image
4. Then go to Appearance -> Customize -> Additional CSS and add the following CSS there:

.fa-twitter-square::before {
    display: none;
}
.fa-twitter-square {
    width: 25px;
    height: 25px;
    background: url("https://yourdomain.com/path-to-image.png");
    background-repeat: no-repeat;
    background-size: 100%;;
    background-position: center;
}
.footer .fa-twitter-square,
.content-area .featured-box .fa-twitter-square {
    filter: brightness(0) invert(1);
    opacity: 0.7;
}
.elementor-widget-qt-social-icons .fa-twitter-square {
    width: 16px;
    height: 16px;
}

    5. Replace the "yourdomain/path-to-image.png" with the URL you copied from step 3
    6. Save the settings

Hope this helps.

You're welcome Pieter.

Let me know if you have any other questions.