The last update took away the feature of using the Bixby button for frequently used app. That was a major hit for me and made the Samsung phones less unique when I go to buy my next phone.
You should be able to toggle Bixby on and off.
1.Go to Settings > Advanced Features.
2.Turn Bixby Routines on or off.
Be sure to click " ✓ Accept as Solution" when you find an answer that works for you.