Hi Rodrigue,
Thanks for contacting Syncfusion support.
We have logged your request as a feature request: "Provide smoother transition animation on drag and drop for ToolBarAdv." We do not have any immediate plans to implement this feature. The code changes will be included in any of our upcoming release.
You can track the status of this defect using the following feedback link:
If you have any more specification replication procedure or a scenario to be tested you can add it as a comment in the portal.
Please let us know if you need any further assistance.
Regards,
Thirupathi B.