Checkout: Remove PayPal button or additional payments buttons
To remove the PayPal button or other additional payment buttons from your Checkout screen, you can use the following method.
Modify Cart settings
The Cart settings can help toggle off the Checkout additional payment buttons. Keep in mind this doesn't always work as Shopify's Checkout is known to be inaccurate at times when handling this toggle option. What you will be doing is turning on the Show additional checkout options in the Cart settings. Once you turn on this option, in most cases it will turn off the buttons on the Checkout page.
Under Theme settings, Cart:
Turn on - Show additional checkout options:
Again - You'll be turning this option on, be sure it's checked on.
Save your theme editor changes.