Thank you for using syncfusion product,
The file format file (.rtf) should contains the content information alone. It won’t contain any information about application level information, for example cursor position selection highlight etc. Because it is differing for each viewer and editor. So, save and restore the cursor position is not possible.
But as a workaround you can place the cursor at specific position on loading each document by holding the caret position in sample level. Now we are preparing the sample for the same will update the sample by 12/10/2019.
Please let us know if you need any other question.