Hi Harish,
Syncfusion Greetings!
We have checked provided sample. In that sample, where to find DocumentEditor? We tried to find it and DocumentEditor control is not there.
Also, can you please share your details about your reported scenario? When opening comments, search and properties pane, you cannot able to view the document fully like below screenshot(you have to scroll to view document) or anyother? Can you please share the screenshot of the issue and share details about provided sample?that will helpful for us to proceed further and provide you solution at earliest.
Regards,