KickstartCassiopeia has the option to disable the right-click function.
Before disabling the right-click, we suggest you consider an alternative solution to protecting your data. If you're attempting to protect your images or content from being used without your consent, we suggest seeing alternative solutions to protecting your images or content online. Disabling the right-click can cause serious accessibility issues and often only angers users. Also, there are so many ways for users to get around this method of protection.
Having said this, you can protect your content in this basic manner.
Go to your module, tab Layout, select the option to disable the right click: