HTC One M8 for Windows - Manual (Page 177)

Settings
Navigation bar
Change the look and behavior of Navigation bar to fit the way you use
your phone.
1. Swipe down from the top edge of the screen with one finger.
2. Tap All settings > navigation bar.
3. Tap the features that you want to change.
Turning airplane mode on or off
In many countries, you are required by law to turn off wireless devices
while on board an aircraft. A quick way to turn off wireless functions is to
switch your phone to airplane mode.
When you enable airplane mode, all wireless radios are turned off, including
the call function, data services, Bluetooth, and Wi-Fi. When you disable
airplane mode, the call function is turned back on and the previous states
of Bluetooth and Wi-Fi are restored.
1. Swipe down from the top edge of the screen with one finger.
2. Tap All settings > airplane mode.
3. Tap the Status switch to turn it on or off.
Settings 177