Already off.If you want to keep Google Assistant enabled, but turn off notifications:
Settings / Apps / Google / Notifications / slide the button to turn it off
If you want to disable Google Assistant:
Open the Google App (if you don't have an icon for it, go to [All Apps] and type "google" in the search box)
Tap the "... more" in the bottom right-hand corner
Settings / Google Assistant / [Assistant] tab / Phone / slide the button to disable Google Assistant
Welcome to Samsung!Tons of useless features.
My first Samsung. Used Motorola for years.Welcome to Samsung!