Can I disable/not use FACE ID on iPhone XS Max,? Do they still have the thumb print feature?

1. You can disable Face ID and use just a passcode instead.
2. No, no thumb print available on those models any more. They no longer have a home button where the print scanner used to be. So no way to scan the print.
3. Apple no longer sells the Xs or Xs Max. You may be able to find left over stock in physical stores though.

New devices from the X on up to the 11 Pro Max do not contain a Touch ID sensor.

There is no law that says you have to use Face ID if you don't want to. You can just stick with a passcode if you prefer.

Apple no longer sells the XS Max.