I noticed that the note 9 does not have the option, the s9+ on 8.0 did have the option. You can still disable swiping to the right for bixby
I'm using bxActions pro, I have it making screenshots. This didn't work reliably on my Note 8, but it has been flawless on my Note 9. I'm going to install it on my mom's Note 9, maybe to launch Google assistant.