I used Android Emulator - Nexus_5x_API_25_X86:5554 ，why I can not find the location of “Development options” ? I tried to click the “setting - About emulated device - Android version” many times ,but it did’t work .
You have to tap on the “Build Number” seven times. Keep digging around for the build number field (it’s not the Android version field).
Thanks ,it worked.