All the hats have a push button but the "Master Mode" one is different. I am having trouble finding the post that explains it but I believe the push on that particular hat would be not user assignable. When you push and hold the button for 0.3 sec it switches to "Relative Mode".
I found a post by rrohde on the ED forums. I have copied and pasted it here;
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Short little video to help visualize (via VKBJoyTester) the MCG PRO's Master Mode "Relative Axes Mode" (sorry about the low quality).
https://i.imgur.com/3a6QCfb.mp4So, what I did during the recording of this clip was:
I pressed and held the Master Mode button down for about 0.3 sec and it changed into relative axes mode (rX and rY axes); I then moved the master mode hat switch around, and as you can see from the clip, the axes did not return to center. At the 18 seconds mark in the clip, pressed the Master Mode button down for a brief moment and it re-centered both axes.
Pressing the Master Mode switch again for 0.3 sec would change the Master Mode operation from relative axes mode back to POV mode, acting like normal digital inputs.
Hope this short clip helped a little to get an idea as to what the relative axes mode does.
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Hope that helps.
Rob