Multiple Screens

Undocking Track mixer

Hi All, I am probably having a brain fart and this is probably a stupid question.
I had a drive failure and had to start from scratch but now have all my programs back.

I used to have my timeline on one screen, and the track mixer on the other.
I cant for the life of me, figure out how to undock the track mixer.

Any help would be appreciated for this old man.

Studio 8 by the way.