Surround : Surround Panning and Mixing : Surround Panner Controls : Multichannel Panner Linking

Multichannel Panner Linking
Stereo tracks with multichannel outputs provide left and right multichannel panners. The Output window provides controls to link the left and right channels for precise panning.
When you create a stereo track that is routed to a multichannel output, the following pan linkage controls are active by default:
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Front Inverse (inverts Left and Right pan control linkage across front)
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Rear Inverse (inverts Left and Right pan control linkage across rear)
The Front/Rear Inverse pan control is unlinked by default.