Dxhtmlgantt How to set the milestone not to move with the lead task move

Gantt
#1

Dxhtmlgantt How to set the milestone not to move with the precessors task move

#2

Hello,
If you use auto-scheduling, you can add the MSO or MFO constraints to milestones. Then they won’t be moved to the newer date when you drag their predecessors:
https://docs.dhtmlx.com/gantt/desktop__auto_scheduling.html#timeconstraintsfortasks
Here is an example:
http://snippet.dhtmlx.com/5/a90f8be13

If you don’t use auto-scheduling, probably you use a custom function to drag tasks. In that case, it is hard to suggest what should be changed as I don’t see your code. I will need a ready demo with all the necessary files so that I can reproduce it locally.