Hi Foulont,
Thanks for your patience.
We have fixed your reported issue “Bug while resizing after adding a new panel in Dashboard Layout“ and have included this fix in our latest Syncfusion packages(version - 17.1.48). Please update the Syncfusion packages to the latest version (v17.1.48) to fix the issue.
Please find the sample for your reference.
Please let us know, if you have any concern on this.
Regards,
Ashokkumar B.