I would like to simply turn off arrow in DNN menu.

I have deleted this from the style sheet and still I get the arrow.

Thanks

.main_dnnmenu_arrow {
 border-right: #cad5ea 1px solid;
 border-bottom: #cad5ea 1px solid;
 border-top: #cad5ea 0px solid;
 font-family: webdings;
 font-size: 10pt;
 cursor: pointer;
 cursor: hand;
}
.main_dnnmenu_rootmenuarrow {
 font-family: webdings;
 font-size: 10pt;
 cursor: pointer;
 cursor: hand;
}

this is all that needs to be done. 

in the dnn:Nav tag add this property and setting.

indicateChildren="false"