You should see the lower parts filled after you click “OK” next to the Swath selection.
GRD means ground range detected. That means no phase information is contained in this product level because it no longer consists of real and imaginary (i+q) parts of the SAR image. You need to download the SLC images.
Please see here:
Edit: Obviously, some of the GRD data are supported (ALOS L1.5, for example), but I have no experience with that and some polarimetric analyses cannot be performed with GRD.