Missing mixer divisions

There used to be a feature in the mixer where you can select any tracks to stay at the far left or far right of the mixer regardless of where you are scrolled in the mixer. Is it gone or am I just not finding it?



Upper left corner used to show or hide panes. Left pane should have that option.

I just didn’t see the buttons that could be slid left or right in the Zones tab of the Left Zone in the mixer. I finally spotted it opening up a project from N7. Thanks!