How Can I Maintain Folders In Alphabetical Order?

I keep the contents of my folders (which contain other subfolders) sorted in alphabetical in order to find them quickly.
But, if I want to add an item to an existing subfolder (File→Print→save as PDF), all the subfolders are out of order, and I need to search for the one I want. This takes a lot of time if there are many subfolders. How can I maintain the order?
—–
Stan Greenberg