MacOS Catalina: How to shrink the Bootcamp partition. No paid software needed (2021)

Disk Utility on macOS Catalina 10.15.7 does not let you shrink or extend the Bootcamp Windows partition.

There are lots of third party software around, but most of them did not support Catalina OS the time of writing (April 2021).

I found a working software: Paragon Hard Disk Manager. The demo version at this link seem to fully work for free for 10 days, so keep that in mind.