the burndown chart displays all iteration timelines

I want my jazz burndown chart only display the current iteration as timeline in x axis , but seems it always displays all iteration timeline in x axis.

I tried to configure the burndown chart parameters by only selecting the "current iteration" , yes, it only display the current iteration chart , but the x axis still has all iteration timelines, this make my current iteration burndown very ugly because the lines and points shrink to together.

is there any way to only display the current iteration timeline in the x axis ? thanks.