After installation of larger hard disk - network storage has old size

I am new here and also a newbie in dealing with RaspberryPi and nextcloud.

I bought a Pi 4 4GB and installed nextcloud there using NextcloudPi.
Since I couldn’t wait, I first installed a small hard disk.
Under NextcloudPi I indicated that I want to use a USB drive.

Meanwhile I got my real hard drive, cloned it and enlarged the partition.
My problem now is that my mounted network drive under Windows still has only 232 GB and not 931 GB.

Does anyone have any idea why?

Does it make any sense to mount it as a USB drive or should you do it via “external memory”?

Thank you.