Hi Sangeetha,
I am not quite sure I understand. Do you not experience the same issue on your end? It might not be the setRowHeight property, but there definitely seems as though something breaks the app as soon as the showHeaders parameter is set to false. As a workaround, the styling I used to hide the headers in my actual project is the following :
/* Hide headers */
.e-spreadsheet .e-row-header, .e-spreadsheet .e-header-panel { display: none !important; }
.e-spreadsheet .e-main-panel .e-sheet-content { width: 100% !important; }
Here is a link to the sample project and a video demonstration :
Thank you,
Remy