You may find this useful: https://www.dnnsoftware.com/wiki/ddrmenu-reference-guide
This may also be somewhere in the new DNNDocs website, but I didn't find it quickly.
This may be what you are looking for: NodeSelector="+0" (I stole this from a website that, I think, does what you want.)
I find it convenient to drop the module version of the DDR Menu onto a page for experimentation. For simplicity use the ULTokens menu and experiment with the NodeSelector parameter