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You can move/rotate/scale a UV set in the viewport just like any other object or also from the numeric inputs in the UV sets section of the Attributes Panel: Object. To be able to see and manipulate UV sets in the viewport you have be in UV Sets selection mode:

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First select your object(s), either by clicking on them in the viewport (Shift to add to the selection, Ctrl to remove from selection), or by choosing them in the Object list panelObjects List. Switch to UV sets selection mode, and then from the UV Sets section in the Object Parameters panel, select one of the UV sets from the list. A green outline of the UV set will appear in the viewport as well as a transform gizmo allowing you to move/rotate/scale it. Note that all the UV sets of all the selected objects will appear in the UV Sets list.

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