RestrictAdminBillingAgreementUsageObserver.php

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<?php
namespace Magento\Paypal\Observer;

use Magento\Framework\Event\ObserverInterface;
use Magento\Framework\Event\Observer as EventObserver;

class RestrictAdminBillingAgreementUsageObserver implements ObserverInterface
{
    protected $_authorization;

    public function __construct(
        \Magento\Framework\AuthorizationInterface $authorization
    ) {
        $this->_authorization = $authorization;
    }

    public function execute(EventObserver $observer)
    {
        $event = $observer->getEvent();
        $methodInstance = $event->getMethodInstance();
        if ($methodInstance instanceof \Magento\Paypal\Model\Payment\Method\Billing\AbstractAgreement &&
            false == $this->_authorization->isAllowed(
                'Magento_Paypal::use'
            )
        ) {
            $result = $observer->getEvent()->getResult();
            $result->setData('is_available', false);
        }
    }
}