How do I centre the column header in tabulator?

You should include your code in your question for us to help better.

There's a property called headerHozAlign that you can set to center.

Here's how you'd do it:

var table = new Tabulator("#example-table", {
    columns:[
        {title:"Name", field:"name", headerHozAlign:"center"}, //center align column header title
    ],
});