Is it possible to autoformat / beautify SQL queries using pgAdmin4?

Currently this feature is not implemented in pgadmin4 which does autoformat or beautify SQL-queries automatically but you can expect this feature in near future version as developers are working on this feature.

Developers discussion mail thread for the feature: https://www.postgresql.org/message-id/CAPG3WN46pgzxKERPpr4TSpVFtyeMhParjvKAUzXWOuwZ4qJPhg@mail.gmail.com

Try the following command:

shift+Ctrl+k