You can put a
in your title name.

Add the CSS style to change the height:

.ui-jqgrid .ui-jqgrid-htable th div {
height:auto;
height:30px; /* your own height in pixel */
overflow:hidden;
padding-right:4px;
padding-top:2px;
position:relative;
vertical-align:text-top;
white-space:normal !important;
}