You have added unique images into your gallery, and probably you want to protect them. Balbooa Joomla Gallery include list of tools which can help you to stop сopying your content without your permission.
1. Click on the button "Settings";
2. In the modal window click on the tab "Copyright";
3. In the sidebar navigation select "General".
Content Protection Tools can help you to save your content by disabling the right click, highlight and copy functions.
Disable Right Click - feature allows you to disable context menu only on Gallery pictures.
Disable Shortcuts - feature allows you to disable the Shortcuts (CTRL+A, CTRL+C, CTRL+X,CTRL+S or CTRL+V, and equivalent keys on macOS) on Website.
Disable Developer Console - feature allows you to disable Developer Console (F12) on Website. Right Click will be also disabled.