Shift-M
/run BattlefieldMapOptions.locked = false BattlefieldMapTab:ClearAllPoints() BattlefieldMapTab:SetPoint("CENTER", UIParent) BattlefieldMapTab:OnDragStop()
(Shift-M again if you can’t see the map)
Then click the map and use the tab to drag the map where you want it.
Right click the tab and lock it.