Dear，
Based on our functional design, we expect to be able to adjust the style and color of the slider by ourselves.
Do you have any good suggestions or plans?
The UI design drawing like this
Hello,
Do you mean the project tasks?
You can do that by using the task_class, rightside_text and leftside_text templates:
https://docs.dhtmlx.com/gantt/api__gantt_task_class_template.html
https://docs.dhtmlx.com/gantt/api__gantt_leftside_text_template.html
https://docs.dhtmlx.com/gantt/api__gantt_rightside_text_template.html
Here is an example of how it might be implemented:
https://snippet.dhtmlx.com/1b8e35562
Another way is to completely change how project tasks will be displayed:
https://docs.dhtmlx.com/gantt/api__gantt_type_renderers_config.html
Here is an example:
http://snippet.dhtmlx.com/10f033bc8
But in that case, you will need to manually implement a solution to display the link drags and progress.
If you mean something different, please describe your requirement with more details.