Airflow connection UI not visible

This is due to a change in 10.0.2. Prior to 10.0.2, there was a hardcoded superuser flag for users.

To give an existing user superuser permissions, so that they can manage connections, variables, etc, you need to toggle the superuser flag in the users table in Airflow's metadata database.

They document how to make a user a superuser using code in the UPDATING.md file, see https://github.com/apache/airflow/blob/master/UPDATING.md#user-model-changes