Is it possible to change S Pen sounds on the Galaxy Note 20 Ultra?

Yes. You can personalize the sounds of removing and inserting the S PEN on the Galaxy Note 20 Ultra.

If you’re from a region that can download Good Lock from the Galaxy store, you can go ahead to do so, and then followed by downloading the Penstatic module. It has the options for you to customize those sounds. (See attached screenshot)

If you’re from a region that can’t download Good Lock from the Galaxy store, you search for the Penstatic apk on the web and install it on your phone. It works standalone without the need to install Good Lock.