Hi Waldos,
Thank you for contacting Syncfusion support.
The mentioned behavior “SfRichTextEditor doesn't show the cursor when the text is long or when I scroll down the text” works as expected from our side. We have prepared a sample video illustration, which can be downloaded from the below link.
Kindly, provide us detailed information about the issue facing from your side or the layout structure of the sample to reproduce the exact scenario which will be helpful for us to provide an appropriate solution at earliest.
Regards,
Devaraj S