Extension Recording Override

Can somebody help me with [Extension Recording Override] option in FreePBX 2.10? I cannot understand how it works.
As i understand if this option is enabled all recording settings done to extensions must be ignored, and RECORDING WILL NOT WORK(?).
I have over 15 extensions configured to be always recorded. And when i enable this option - nothing happens - extensions that configured to be recorded are still recorded. So i can’t see any differences.
Maybe i have a completely wrong understanding of this option. What i need is to completely disable call recording for all the extensions without having to disable it for every single extension.