Setting to hide variables in Outline

Maybe it would be good to have the option to hide the variables in the outline list and only show classes and methods because it is very long with the variables included

No file, test, or entry point is named. Start by locating the outline list implementation and how Python classes, methods, and variables are represented, then trace existing settings or filtering behavior. Done means users can choose to hide variables while retaining classes and methods in the outline.

Written by the indexing model from the issue text.