We do not provide a built-in option to disable right-click. However, you may use a third party script to disable right click.
Copy the code from the third party provider.
Open your site builder.
Click Manage, then click Settings.
Click Header and Footer Code from the menu on the left.
Paste the code under the Header tab.
Click Save and republish your site for the change to take effect.
Now when the user right-clicks on your site, they will receive a message stating that the function is disabled. You can replace the display message by inserting code conveying the message that you would like to be displayed.