I like the new design but it has the following drawbacks over the old design:
In the new design, users of pgAdmin cannot create multiple new users with a single click of the "Save" button.
Errors such as "Username/Email already exists" will now appear only after clicking the "Save" button, rather than being shown as the user types the username or email address, as in the previous design.
In the old design, there was an option to reset if the user was mistakenly deleted by default.
I know we need create user dialog as in future we are going to add custom role in that dialog. Apart from above it looks good to me.
To add to my previous email, the user edit will now open a pop-up instead of current in-table edit. Few of the users have reported sluggish UI editing when having many users. That will be fixed with single user edit.
I've been working on making the user management open in a tab instead of a dialog for better user UX. The new design looks like below. Please note, once we start working on permissions (RBAC) we will add sub tabs - Roles and Permissions.
Please let me know if we need to change anything in this or any questions.