The only way to search for items stored locally on your Galaxy is by going to the App screen (swipe up on the home screen).
To opt out of Samsung's promotions, head over to Settings > Samsung account > Security and privacy and turn off Get news and ...
It might be possible to disable Bixby entirely on your Samsung phone, depending upon which model you own.
To hide apps on a Samsung Galaxy S10, go into the Home screen settings from your app drawer or install a third-party app to lock apps with a password.
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