how to fix this alert notice in WordPress admin screens,

You could also roll back the plugin version to 6.2.3. It’s easy, follow this video https://youtu.be/3lS9A-UeUic – my website is working again after I did.

Until this issue is resolved or solution better explained by ACF team, that is what I would do.

@byron it means you should consider removing the HTML in that field named qatitle and maybe add it to the template file where the field value is called up with the_field method.

But if you trust the content in that field then you can use get_field method.
There is another solution where you can allow specific HTML tags as shown here https://www.advancedcustomfields.com/resources/html-escaping/#customization.

If you need any further assistance on then consider openning a ticket from here https://www.advancedcustomfields.com/support/

@avviano thank you!!

@acfsupport thank you for the additional information.
ill try to replace to get_field.

Just paste the below code in Theme > functions file.

add_filter( ‘wp_kses_allowed_html’, ‘acf_add_allowed_iframe_tag’, 10, 2 );
function acf_add_allowed_iframe_tag( $tags, $context ) {
if ( $context === ‘acf’ ) {
$tags[‘iframe’] = array(
‘src’ => true,
‘height’ => true,
‘width’ => true,
‘frameborder’ => true,
‘allowfullscreen’ => true,
);
}

return $tags;
}

https://www.advancedcustomfields.com/resources/html-escaping/#customization