You can configure power saving on this page.
Power Saving Mode - It's enabled by default. If enabled, you can save power by changing the Wi-Fi Range and Auto-disable Time. If disabled, the Wi-Fi will not be shut down and you can have the longest Wi-Fi range.
Wi-Fi Range - Select a Wi-Fi range.
Wi-Fi Auto-disable Time - If no clients connect to the device's wireless network in a period of time (10 minutes by default), the Wi-Fi will be shut down. You can press the power button to resume the Wi-Fi.
Click Save to save your settings.