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We find by simulations and experiments that the emergent edge flow in a confined active-rotor system exhibits a striking oscillation as the distance to the boundary increases,and that this collective motion shows three different modes as the density changes.We also identify the structural origins of the oscilation(due to the confinement-induced density inhomogeneity)and those of the transitions between different modes(due to the percolation of solid-like region or the occurrence of defect-induced particle rearrangement).Our results highlight the significance of density inhomogeneity and structural information in determining collective behaviors of active matter.