This post describes how to enable/disable PayPal External Pop-Up Window.
WEB_FEATURE_CONTROL Content Resource.
For example, TAP in payment01: https://tap-payment-01.test.tvlk.cloud/resource/content/edit?name=WEB_FEATURE_CONTROL&lang=en&country=&entry=
paymentPaypalUseExternalWindow entry, and change the value as you need. Value 1 will make web use external window, value 0 will make web redirect directly to PayPal.