Quick layout question

The timeline/effects section used to stretch the entire horizontal length of the window at the bottom. I did something I'm unaware of that cuts it off, as you can see in the linked picture, and now the square that used to be in the upper right stretches the entire vertical length.

How do I get that space back for the timelines/effects?

dl.dropbox.com/s/b3ybl7x6ejcvmyl/Screen%....00.05%20PM.png?dl=0

Thank you!

EDIT - Linked removed since the question was answered. 

double click on right top on the insta-myasirila5.

Awesome thank you. I tried to retrace my clicks but hadn't knowingly double-clicked there. All set!