When you drag and drop a data-grid component into your form you will notice that it shows two rows by default. However, you may want to change this so that behaviour to show more or less rows. To do so you simply need to change the default value of the data-grid component itself using the steps outlined below:
Open the component setting for the data-grid
Navigate to the "data" tab, here you will see a "default value" property showing a preview of the data-grid.
Use the "add another" button or remove icon to add/remove rows from the default value and press save.
Refresh your browser or team's app before navigating to the preview tab to preview this change. Without refreshing you may still see the 2-row table.