<div id="diagram"></div>
<script>
var diagram = $("#diagram").kendoDiagram({
    shapes: [{
        type: "rectangle",
        x: 100,
        y: 100,
        width: 200,
        height: 100,
        fill: {
            color: "#ff6358"
        }
    }]
}).getKendoDiagram();

var rectangle = diagram.shapes[0];

// Hide the rectangle
rectangle.visible(false);
console.log("Visibility:", rectangle.visible());

// Show the rectangle again
rectangle.visible(true);
console.log("Visibility:", rectangle.visible());
</script>