Documentation
Configuration / sort_order
When this option lets you change the order sort the files by this defaults to "asc" but can be set to "desc" for descending order. You can also change column to sort by.
Example of usage in TinyMCE
tinymce.init({
...
moxiemanager_sort_order: "desc"
});
Example of usage in standalone mode
moxman.browse({
...
sort_order: "desc"
});