如果要隐藏或移除AmCharts中的categoryField，可以使用以下方法之一：

方法1：设置categoryAxis的showGrid属性为false

var chart = am4core.create("chartdiv", am4charts.XYChart);
chart.data = [{
  category: "Category 1",
  value: 10
}, {
  category: "Category 2",
  value: 20
}, {
  category: "Category 3",
  value: 15
}];

var categoryAxis = chart.xAxes.push(new am4charts.CategoryAxis());
categoryAxis.dataFields.category = "category";
categoryAxis.renderer.grid.template.location = 0;
categoryAxis.renderer.minGridDistance = 30;
categoryAxis.renderer.labels.template.adapter.add("text", function(text) {
  return "";
});
categoryAxis.renderer.grid.template.disabled = true;

var valueAxis = chart.yAxes.push(new am4charts.ValueAxis());

var series = chart.series.push(new am4charts.ColumnSeries());
series.dataFields.categoryX = "category";
series.dataFields.valueY = "value";

方法2：设置categoryAxis的visibility属性为false

var chart = am4core.create("chartdiv", am4charts.XYChart);
chart.data = [{
  category: "Category 1",
  value: 10
}, {
  category: "Category 2",
  value: 20
}, {
  category: "Category 3",
  value: 15
}];

var categoryAxis = chart.xAxes.push(new am4charts.CategoryAxis());
categoryAxis.dataFields.category = "category";
categoryAxis.renderer.grid.template.location = 0;
categoryAxis.renderer.minGridDistance = 30;
categoryAxis.renderer.labels.template.adapter.add("text", function(text) {
  return "";
});
categoryAxis.renderer.labels.template.adapter.add("visible", function(visible) {
  return false;
});
categoryAxis.renderer.grid.template.disabled = true;

var valueAxis = chart.yAxes.push(new am4charts.ValueAxis());

var series = chart.series.push(new am4charts.ColumnSeries());
series.dataFields.categoryX = "category";
series.dataFields.valueY = "value";

这两种方法都是将categoryAxis的标签设置为空或不可见，从而实现隐藏或移除categoryField的效果。