First, welcome to the community.
Well, you will need to query for the specific nodes/relationships you want since you have mixed multiple data models in the same database. If you are just experimenting to learn, then I suggest you create different databases for each data model you are experimenting with. That way it will be much easier to query and manage the data.
You can create multiple projects in Neo4j Browser, and each of the those projects can have multiple databases.
You can also clear all the data in a database with the query below. You can do that and then reload the data you want to visualize. Once you do that, you can run match(n) return n to see all the data in the database.
To delet all data:
match(n)
detach delete n
