Settings>general management >Samsung keyboard settings >Handwriting. Change time to maximum 2 seconds (default is 0.5 secs). If this is still too short a time delay, then consider sending feedback via the Samsung Members app.
I get that you're using the S pen as the input method, but if you are using the pen to write (as opposed to your keyboard) within a text box and you normally use the Samsung keyboard, then my advice still stands.
