Any changes you make to the list view with the custom blocks I made will be applied to the main list data. Also, it lets you use native list blocks like length of and contains so you don't need to have a result variable :) Opened list is also temporary unless you use the custom blocks or manually save it!
This is a system that allows you to go in and out of lists/sublists! There are a bunch of operations you can do with it inside the project. Hover over and press the buttons! This is an expansion of my 2D list project: https://scratch.mit.edu/projects/1384311695/