The notification panel on the HTC One M8 is filled with many quick settings and toggles to get an easy access to most of the system settings. To customize Notification Panel on HTC One M8, do as follows:
1. Use 2 fingers and slide down the notification bar to open the extended notification panel
2. Tap the Edit button on the top right
3. Press and hold the icon (it is a 3 small lines icon) next to each toggle button to rearrange the position
4. Since there are only 12 spots for adding buttons, there are some hidden items at the end of the menu, and you just need to drag to add them to quick settings panel.
5. Once finished customizing, press the Done button
Tips:
*1: if you long press on an icon, the corresponding menu is opened
*2: To view the notifications use only 1 finger to slide down the bar
*3: To add the battery percentage on the notification bar, follow this path: Settings > Power >> Show battery level
*4: Available Quick Settings are: Extreme Power Saving Mode, Brightness, Settings, Wi-Fi, Bluetooth, Airplane Mode, Power Saver, Auto Rotate, Mobile Data, Sound Profile, Do Not Disturb, HTC Mini+, user Card, Wi-Fi Hotspot, Screenshot, GPS, Data Roaming, Media Output, Auto Sync, Ringtone, Screen Timeout, Sync All, Data Usage, NFC