The solution is a burst shot, and the trick is using the simple swipe-down gesture on the shutter button. Most people tap the shutter, but if you quickly tap and swipe down the shutter button ...
To opt out of Samsung's promotions, head over to Settings > Samsung account > Security and privacy and turn off Get news and ...
You can hide incoming messages on your Samsung Galaxy S10 by changing your Notifications preferences, or hide the Messages app with a third-party app.
It might be possible to disable Bixby entirely on your Samsung phone, depending upon which model you own.