File Nesting Dialog
This dialog opens when you click File Nesting on the context menu of the title bar in the Project tool window.
PyCharm provides a set of predefined rules. You can edit these rules as well as define your own custom ones.
Show files with the same names as nested
Click this button to add a new row and specify the "parent" file suffix and the matching "child" file suffix.
Click this button to remove the selected rule from the list.
Reset to Default
Click this button to discard all your custom patterns and reload the default rules.