Since KitKat Google has decided to hide the Developer Options so only advanced users who know what they do can access it.
This can affect phones like: HTC One, LG G2, Motorola Droid, Nexus (5,7,10), Galaxy Note (10,3), Galaxy S4, Galaxy S5 etc.
Good thing is that it is not hard to get it back.
This article will show you how to enable hidden Developer Tools on Android KitKat 4.4.X in 3 easy steps.
Go to Settings (icons may vary)
Go to About phone
Click (tap) Build number 7 times
While tapping you will see how many times you have to tap more to enable settings
You can access Developer Options in main Settings menu at the bottom