Hi Tamsin,
Thank you for reaching out to us. Please be advised that the WordPress version 5.4.0 which is a major update, is not yet compatible with our theme see https://theme.co/docs/version-compatibility
However you can temporarily fix the issue by adding the following code in the child theme’s functions.php file (see https://theme.co/docs/child-themes):
/* Temporary fix for Gutenburg issue with WP 5.4 */
add_action('admin_head', 'fix_content_builder');
function fix_content_builder() {
echo '<style>
.cs-disable-gutenburg #editor .edit-post-visual-editor.editor-styles-wrapper {
display: none!important;
}
</style>';
}
This will be fixed in the next release of the theme and then you can safely remove the above code. Hope this helps!