Press and hold the Bixby button
Open Bixby Home
Tap the three-dot menu
Tap Settings
Turn off Bixby Voice
Turn off Bixby Home
Turn off Bixby Key
Go to Settings
Tap Apps
Select Bixby-related apps
Tap Disable
Confirm the action
If Disable is unavailable, tap Uninstall updates first
Use a third-party button remapper if needed
Restart the phone