Thank you for contacting Syncfusion support.
Based on provided information we understood your requirement is to hide the context menu on the right click.
Currently we only have options to hide the context menu items Customize the Ribbon and Customize the Quick Access Toolbar by setting the properties EnableQATCustomization and EnableRibbonCustomization to false. We have prepared a sample for further reference.
But we do not have an option to hide the context menu. We already have logged a feature request to support for adding or removing items from context menu. Based on this feature, you can achieve your requirement by removing all the items which will eventually hide the context menu.
We will implement this feature and it will be released in any of our upcoming releases.
You can track the status of this report through the following feedback link,