Mixing : Basic Mixing : Output Windows for Tracks and Sends : Targeted Windows

Targeted Windows
When lit (red), the Target indicates its window is “targeted,” and the next window opened of the same type replaces the current display (unless it is opened as an additional window with the Shift modifier). When unlit, the target is gray, and the current window anchors to its current contents and location on-screen. Opening additional windows does not affect anchored windows.
To set an open Send window as the target window:
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Plug-In windows have additional features related to the Target (such as Focus of Settings commands). See The Plug-In Window.