App macOS Core Data and Swift

Hi,
I'm creating an app for MacOs, not iOS, using Core Data.
The data model is already done, with all tables and relationships defined.
Now I need to do two things:
How to remove that “+” that appears in the upper right corner of the application;
How to build the menu, so that you can place calls to the features I need in it;
Include records in each different table;
Perform queries on tables

All examples I found speak to change the AppDelegate.swift file, however the created app does not have this file, as it was created following the example of the link https://developer.apple.com/documentation/coredata/creating_a_core_data_model.

Can someone tell me where to find a good example of an app with Core Data, Menu and CRUD operations, using Swift?

Thanks


P.S .: Sorry for my English