[Horizontal scroll jump]

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
    } 
});