I used PGAdmin4 version 6.11 on windows, and it worked:
I put my projects’ hostname “xxx-xxx-000.cloud.neon.tech” in the host name/address box, default port, ‘main’ as the maintenance database, and the provided username/password from the console. Apart from that, I used the default configuration.
Note that PGAdmin4 version 6.10 and lower do not ship with a version of psql that supports, so you might have to update your version of PGAdmin4.
Oh! under connection details the domain was very different from what I grabbed from the connection string Hasura had (which is how I first got connected to Neon)
getting the correct connection details from the dashboard solved it, thank you very much @Daniel !