How can I remove or transparent the connector?

Do you have any settings?

Could you pleas,e clarify in what diagram do you need to remove the connector? in case of using the flow chart - you may use it without the connectors at all.
In case of using the org-chart - unfortuantely it is not available to remove or hide a specific shape connector.

i’m using flow chart.

let diagram = new dhx.Diagram("diagram", {
    lineGap: 25,
    defaultShapeType: "template"
});

please teach for me use diagram without connectors.

You can see in the following demo sample:
https://snippet.dhtmlx.com/loz7yh2y
that there no connectors between the shapes.
You can aklso remove the connectors from that diagram:
https://snippet.dhtmlx.com/4daklwex
just check the commecnted lines in the dataset.