PostgreSQL - How to hide system schemas?

Choose schemas you want to work with in schema chooser:

or

It is not a convenient way :)

What if there are tens of non-system schemas? Should I click them out all?

Can you add some option like "Hide system schemas" and make it checked by default?

System schemas are not needed actually.

By the way pgAdmin is not showing them.

You're right. There are feature requests similar to your description:

• https://youtrack.jetbrains.com/issue/DBE-3010
• https://youtrack.jetbrains.com/issue/DBE-6445