On the server settings page, the postgresql.conf settings are displayed. The settings are grouped by category as defined in the pg_settings view. Favourite categories are sorted first, which can be configured under Preferences/PostgreSQL/Category sort.
When double clicking a setting, full descriptive information is displayed. For 9.4 servers, the settings may also be changed here and are written to the server configuration on save. When applying the settings, a server reload is executed to make the previous changes active (if possible).