Folder structure as a tree

in the main window, I now see folders as folders without their contents. I click on the folder and see the contents of the folder. I don't want to click on a folder and see its contents I want to see all the contents of the folder including the folded folders in the form of a tree.

this is more convenient. you can see everything at once.

Start in the Android main-window folder browser and trace how folder contents are currently shown after a folder is selected. Define the tree behavior for nested and folded folders, then verify that the main window displays all folder contents at once without requiring clicks.

Written by the indexing model from the issue text.