EX3700 WiFi Coverage / Wireless Output Power

I updated my EX3700's firmware and the WiFi Coverage / Wireless Output Power interface that would let you choose between 25% / 50% / 75% / 100% is no longer on the menu. However, it can still be accessed from the old URL (http://192.168.1.250/wifiCoverage.html). Why was this interface removed from the menu? Will changing the settings directly from the old page URL do anything, or is the power output locked at a certain % now? I originally bought this router specifically to run in low power mode.