Not enabled currently. ZCL is only traded on c-cex but miningpoolhub doesn't support that exchange site yet.
That is why Zclassic row doesn't show profitability numbers at main homepage.

Auto switch will be enabled when
(1) I complete exchange API connection to c-cex
or
(2) bittrex supports zcl

I hope bittrex to support it, since I actually don't think c-cex is reliable to trade our coins.

I recommend you to mine and sell it manually at this moment.