Hi Gian Piero Truccolo,
Greetings from Syncfusion.
This update is mainly to get the confirmation of your reported issue to proceed with this without any misleading.
We analyzed the given sample from our end. The issue that you come across is "While resizing the node, the Gantt node is moved to day by day instead of pixel" ? Can you confirm on this issue please?
Regards,
Sridevi S.