Hello @3dtobias
I tried to replicate the issue you’re facing, but I didn’t encounter any problems on my end. When I click the PayPal button, the iframe along with the log in panel appears as expected. Does the panel disappear during the payment process? At what point does this happen?
If you can reproduce this behavior, we suggest performing a full conflict test to rule out eventual issues with the theme or a different plugin. We recommend temporarily activating the default theme Storefront and disabling all other plugins except for WooCommerce and PayPal Payments to see if the behavior persists.
Here’s a guide that explains the steps in more detail: How to test for conflicts. Please let us know how this works out for you.
Kind regards,
Krystian