You can enable or disable the context menu option (i.e. right-click menu) for a particular user. To access this option, perform the following:
Click the user Avatar in the top right corner.
Select Settings from the drop-down menu.
On the left-hand side menu bar, click LaTeX Math.
The LaTeX Math settings page is displayed.
To enable or disable, check or uncheck the Enable context menu (when using client-side MathJax rendering) checkbox.
Click Save.
...