To disable the hotspot flashing on your live demos:
Open your prototype and, in the top-right corner, click the Share button.
At the bottom of the share modal, click Link Settings.
Click the More Options drop-down arrow.
Next to Prevent hotspot hinting, toggle the switch on.
This will create a new unique share URL at the bottom of the modal that will need to be copied and forwarded to your users. If you’ve previously created share URLs that did not have this setting applied and you no longer want them to be accessible, you’ll need to revoke those share links.