The latest public beta of Default Folder X, version 5.2.6b6, supports Dark Mode in Mojave and all changes up through the latest developer build (Mojave developer beta 7).
In addition, this beta release allows you to create separator lines in your Favorites menu to help keep it organized and easier to use. Just choose on “Add Separator Line” when you click the ‘+’ button in Default Folder X > Preferences > Folders > Favorites, then drag the separator to wherever you want it in your list of favorite folders.
5.2.6b6 also addresses a bug when relaunching the Finder, improves the behavior of DFX’s drawer in the Finder, and adds a compatibility fix for Newtek’s LightWave applications.
Get all the details and download your copy from the Default Folder X Beta Testing page.