I installed Default Folder X last night on a Mac, realizing that the simplified save dialog was suppressed when this utility is running; I don’t like, and never have liked, the simplified version.
Fortunately, a fix is only two Terminal commands away:
defaults write -g NSNavPanelExpandedStateForSaveMode -bool TRUE
It’s an old tip, but a good one.
The Default Save As… sheet
The Expanded Save As… dialog