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We're aware of the issue and it will be fixed shortly. The toggle will only appear on cards that require this feature.
It appears in my R9 380 4GB...
I have a Sapphire HD7970 6GB OC Vapor-X Crossfired with a Sapphire R9 280x OC Tri-X.
Before anyone highlights this: HD7970 and R9280x are not on the official Crossfire Chart, but the R9 280x is essentially a rebadged and improved HD7970 3GB OC edition. It works fine.
The power option initially appears in the Gaming -> Global Settings Menu at first launch.
If I turn it off the button dissapears.