Thanks for contacting Syncfusion support.
Currently, SfRichTextBoxAdv doesn’t have options to disable opening and saving documents through API. We have logged this as a feature request. We will implement this feature in any of our upcoming releases.
Now, you can now track the status of your request, review the proposed resolution timeline, and contact us for any further inquiries through the below link.
However, we can disable keyboard shortcuts to perform these operations. We have prepared a sample tried on our side to demonstrate the same. Please do find the sample from below link.
Could you please provide us the screenshot or description of the requirement if the provided solution does not help to achieve the requirement. This will help us to serve you better.