The Cart page should always include the Checkout button, but there are also optional, additional buttons for specific payment forms, such as PayPal or Apple Pay. Similar to dynamic checkout buttons, these allow customers to streamline the transaction by preselecting their preferred payment method.
Are these controlled by the theme or platform?
The theme only provides a location for these buttons. The buttons are produced by the Shopify platform and can be activated by configuring your Payment Providers settings.
Display the PayPal Express Checkout button
This button will appear on the Cart page when PayPal is set up as an accepted payment provider in the Payment Provider settings.
Other additional checkout buttons
Apart from the PayPal button, customers will be presented with other options for payment providers. Which payment forms appear depending on the browser the customer is viewing the storefront with. For instance, if Sita is using Google Chrome, G Pay will appear. If Thom is using Safari, Apple Pay will appear.
If a particular payment form is not appearing, confirm that the payment form is set up in the Payment Providers settings and the internet browser being used is capable of displaying the desired payment type.
Remove the additional checkout buttons from the cart page
Naturally, the clear approach for removing the additional checkout buttons would be to remove the corresponding payment provider. However, it may be the case that the payment providers are still needed as payment types, but the buttons are conflicting with added apps or customizations. If this is the case with your store, consider submitting a request for a Paid Theme Customization.
Please note that the customization offered here will remove all additional checkout buttons from the Cart page only. These will still appear in the Checkout, as this page is outside the control of the theme.