[grace-baker Hexnode 28 January 2020 grace-baker Moderator]

Hey, Thanks for reaching out to us.

Please navigate to Android->Restrictions->Allow Location Settings. Disable the ‘Mock Location’ option.
This will block the user from turning on the Mock Location which can be enabled from developer options. Disabling this option on devices in Device Owner mode will completely disable the entire developer options on the device.
The feature is supported only on Samsung Knox Standard SDK 2.0 and up, LG GATE and Kyocera devices.

Kindly use the help link for restrictions on Android devices for more info.

Cheers!
Grace Baker
Hexnode MDM