Thank you for using Syncfusion Dashboard Platform.
At present we do not have support for adding more number of rows in the dashboard designer. However we will consider this as a new feature request, and we have added it to our feature request list, and it can be tracked through our Feature Management System. This feature will be available in one of our upcoming releases.
Meanwhile, could you please provide more details regarding your requirement like how much number of rows you like to add, how many visualization and filter widgets you planned to showcase in dashboard, etc.? It would help us to implement the feature in line with your requirement.
Please let us know if there is any concerns.