There are 2 docks for the Fetish Map, the standard Dock (Map at default size) and the MiniDock (Map at roughly 1/3 size).
The purpose of these docks is to allow you to set where the map positions when you use either of the related size button. For example, set the MiniDock to the upper left corner of your screen then close it. Now when you click the MiniMap button, the map resizes and moves to match the MiniDock. The MiniMap button is a toggle, uncheck it and the Map window should revert to its previous size and possition.
That the Map window itself is resizable doesn't really make either of these obsolete. Personally I keep the map open in mini mode (shoved off to a corner) when running around questing, then toggle it back to full size when I need to see more detail.
Note: The inventory window also has a dock for its shrink mode.
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