Hello
You can add this code to the main form script.
Ext.override(Ext.grid.Panel, {
listeners:{
'cellmousedown': function (sender, td, cellIndex, record, tr, rowIndex, e, eOpts){
if ((cellIndex < 2) && (sender.grid.getView().el.dom.scrollLeft < 0)){
sender.grid.getScrollable().scrollTo({x: 0})
}
},
scope:this
}
});