After updating note 9 to Android 10 and one ui 2.0 , direct pen input is removed from s pen settings. On one ui 1.0 when pen is hover over the any input box there was a direct pen icon appearing but now it is disabled on one ui 2.0
Where are you located? U. S. Here.. No update yet..
Check in Settings -> General management -> Language and input -> On-screen keyboard -> Samsung keyboard. You should find a "Pen detection" option.