Each time I create a new sub-folder (whether under Local Folders, a sub-folder in Local Folders, or in an IMAP-folder or sub-folder), I have to manually apply the "Apply Columns to" and "Apply View to" of the upper folder to each such new sub-folder, OR set new Columns and View options to such new sub-folder.
I suggest that, each sub-folder is automatically assigned the Columns and View options of the upper-folder with the option available to the User to change Columns and View.