Save directory not sorted:

When I invoke the Libreoffice Save or Save-as dialogue, the directory tree that opens is not properly sorted (the subdirectories are not alphabetical).

How do I fix this please?

Just above the names, is a small arrow, light gray in color. click it.

I wasn’t there before but when I clicked the “Name” bar it appeared. Thanks. Must be something to do with my GTK theme.