How can I alter the Shop Pay checkout process?

Hello, when a user logs in to their shop pay account - the check flow changes from the default check out flow as defined by the checkout settings in admin settings. Thank you for your help. I’m trying to adjust the following:

  1. The marketing checkbox is no longer pre-selected and I can’t find where to enable pre-selection.

  2. The gratuity options no longer appear.

  3. Other payment options are no longer available except for credit card and shop pay.