Add hook code to functions.php file in child theme
1: Remove QR Code in mail when booking event succesfully
add_filter( 'el_filter_attach_qrcode_mail', '__return_false' );
2: Remove PDF ticket in mail when booking event succesfully (From version 1.2.1)
add_filter( 'el_filter_attach_pdf_mail', '__return_false' );
3: Remove QR Code & PDF ticket in mail when booking event succesfully
add_filter( 'el_booking_mail_attachments', function(){ return array(); } );
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