Increase time range in Graph

I would like to have in a graph free space on the right to draw son scenarios in time, I do not know how to have this free space, for example one year more,ect...

Best Regards,

Easiest way... simply hit "END" key on your keyboard multiple times.

Second way is setting value being larger than zero to SetChartOptions' 7th argument "blankbars".

Thanks @fxshrat for your reply.