Partition proposals in 15.2 installation

Yast is making some absurd proposals for the root partition installing Leap 15.2. Initially, it defaults to using all of an existing 732 GB partition, with /home on that partition as well. In a guided setup, with a /home partition, it proposes 256 GB, and doesn't allow me to shrink it. Snapshots don't grow that large. Why would this be so excessive? Thanks, Jon Cosby