If self-hosted, whether to invite others

1. if I self-host, I can only use one organization, can I have multiple users in it?

The reason I asked the above question is because I saw the following screen in my local environment! (deployed on my laptop, localhost:3000)


What's confusing is that the word "organization" appears during the account signup process.

Does "organization" refer to a single account?

2. If I self-host the retool, how can I manage my members?

In other words, is this possible for the following scenarios?

I create AppX and AppY with an account named userA.

AppX and AppY can only be modified by userA.

Can I give userB permission to view AppX and userC permission to view AppY?