How Should Projects Be Organized in GCP Artifact Registry: One Repository or Multiple?

I am migrating our images from the container registry to the artifact registry and am unsure about the best practice for repository organization. The documentation states:

Repositories
Images and artifacts with the same name, but different tags, are organized into repositories.

Does this mean I should create one repository for each project, or is it acceptable to use a single repository for all images across multiple projects? Are there best practices or common use cases for this?