if you use one of the default controllers, like 'example', it will be down near the bottom.
Then, just put all the fields you want into the form layout, either in the controller (a good example of a controller based CRUD is the 'user_registration.php' in /controllers ) or in the YAML file (a good example of the controller AND YAML setup is of course 'example.php' and 'example_form.yml', in /controllers and /definitions respectively).
sorry for the wrong advice earlier, I hope you didn't read that :lol: