Previously, the Realize Instances node would always realize everything in the geometry. Now it's possible to more selectively realize parts of the geometry: * One can choose which top level instances should be realized. * The realization depth can be controlled per top-level instance. For example, if there are 5 top level instances, each of which contains 10 other instances, it's now possible to realize only one level so that one ends up with 50 instances. Pull Request: https://projects.blender.org/blender/blender/pulls/116582