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You could specify VertexShapeFunctionVertexShapeFunction or set GraphStyle -> "Default"GraphStyle -> "Default"

RandomGraph[{1000, 2000}, VertexSize -> 6,   VertexShapeFunction -> "Circle"]

RandomGraph[{1000, 2000}, VertexSize -> 5, GraphStyle -> "Default" ]

You could specify VertexShapeFunction or set GraphStyle -> "Default"

RandomGraph[{1000, 2000}, VertexSize -> 6,   VertexShapeFunction -> "Circle"]

RandomGraph[{1000, 2000}, VertexSize -> 5, GraphStyle -> "Default" ]

You could specify VertexShapeFunction or set GraphStyle -> "Default"

RandomGraph[{1000, 2000}, VertexSize -> 6, VertexShapeFunction -> "Circle"]

RandomGraph[{1000, 2000}, VertexSize -> 5, GraphStyle -> "Default" ]
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You could specify VertexShapeFunction or set GraphStyle -> "Default"

RandomGraph[{1000, 2000}, VertexSize -> 6,   VertexShapeFunction -> "Circle"]

RandomGraph[{1000, 2000}, VertexSize -> 5, GraphStyle -> "Default" ]