The watermark image is applied on images to act as a copyright to protect your images from being downloaded and used without your permission. You can select one or multiple images to have the watermark enabled, for each individual listing.
However to disable it, we have a master switch to deactivate the setting without having to manually update each listing and image. Follow the below steps:
1. Go to Admin > Profile screen. Select the XML tab.
2. Set the Watermark field as Disabled.
3. Click on Update Profile when done.