How to Delete a MacOS Notification Center Widget?
It is probably unsafe to delete executables without knowing if the main app executable depends on them.
Widgets are .wdgt files. To completely remove the widgets you must delete them from your machine or move them to a different folder. There are 2 Library folders on your computer. Each Library folder has a Widgets folder. You may remove the widget from the widgets folder to get rid of it. One Library folder is in your home directory. /Users/username/Library, and the top level folder is /Library. You cannot edit the latter on macOS Catalina.
It may also be possible that apps bundle the widget in the .app bundle. So right click on the myapp.app file & "show package contents". Some folders in, Resources folder may contain a wdgt file.
You can also use app like EasyFind to search the whole Mac for the extension.
If you need the app, but not its widget:
Open the notification panel and click on Today at the top of the pane. After that look to the bottom of the Today view and you should see an Edit button. Click this button. Now the active widgets will appear on the left. There will be a red circle at the top of each widget. Click this to remove the widget. See the images below.
After clicking Edit we see:
