How to appear turbo preview graph?

Ummm.... I'm not good at English, but I try to ask you guys..
Anyway, Turbo preview graph disappeard when I clicked a button(It looks like <)
I want to appear this graph when I make engines.. Anyone who knows how to get back this graph? Please help me..
Anyway, Turbo preview graph disappeard when I clicked a button(It looks like <)
I want to appear this graph when I make engines.. Anyone who knows how to get back this graph? Please help me..