Customize the Column Menu Icon in JavaScript TreeGrid

You can customize the column menu icon by overriding the default Tree Grid class .e-icons.e-columnmenu with a custom property content as mentioned below,

    .e-treegrid .e-columnheader .e-icons.e-columnmenu::before {
        content: "\e903";
    }

In the below sample, Tree Grid is rendered with a customized column menu icon.

You can refer to our JavaScript Tree Grid feature tour page for its groundbreaking feature representations. You can also explore our JavaScript Tree Grid example JavaScript Tree Grid example to knows how to present and manipulate data.