There are some issues in Elements with performing a right-click using a trackpad.
The primarily problem area is in the component list. Almost everywhere in Elements a right-click can be performed with a CONTROL-Click to bring up a dropdown. But in the Component list it does not work on Globals or Custom components. Instead here you have to use the alternate two-finger click on the trackpad in order to get at the dropdown.
It would be really nice to get this working consistently across Elements.
I don’t know if the same problems exist when using a mouse as I don’t have one with which to test. I only use a trackpad, both on my laptop and desktop machine.