Disable fixed headers position on horizontal scroll

Hello, i want to disable this behavior with gantt header of timeline, here is the example :

I see from this post that it is a native behavior of dhtmlx gantt

Hi!
sticky labels feature can be disabled at scales configuration using the sticky property:

gantt.config.scales = [
  {unit: "month", step: 1, format: "%F %Y", sticky: false},
  {unit: "day", step: 1, format: "%j", sticky: false}
];

here is the related docs article:
https://docs.dhtmlx.com/gantt/desktop__configuring_time_scale.html#stickylabels