Skunk is the only algo showing in the benchmark dialog with z-enemy enabled. Shows supported algos all enabled/default in the managed software settings.
This is similar to what Bob-Bit answered to another question, and it's related to that you need a pool for the benchmarking.
While ccminer can benchmark algorithms without a pool, in "offline" mode, that's not supported for Z-enemy. Instead you need to go to the Options dialog, Profit switching section and make sure you enable some pools so the benchmark feature have something to work with. Can you please check if this resolves you question? Thanks!