<https://forum.affinity.serif.com/index.php?/topic/125349-trying-to-adjust-speech-bubbles/#comment-686816>
<http://schema.org/text>
"They won't appear unless you select either the Node tool or the original tool you used to create the Callout (Ellipse or Rounded Rectangle). They don't appear with the Move tool selected.\n "
<https://forum.affinity.serif.com/index.php?/topic/125349-trying-to-adjust-speech-bubbles/>