There is a way to make a buss visible on the main arrange page. While in the mixer, click on the buss. Click in that title area that says Auto OFF just above the buss name. Click on Add/remove parameters. Select Volume in the right pane and then click on ADD to the left of that.
The buss will now appear on the main arrange window. Press A to show the volume automation and at this point you will see a blue line. Buss volume can be adjusted here and automation can be recorded and viewed etc..Or simply left off allowing you to manually adjust buss level.
Even pressing A again will put the tracks back to normal. The buss will remain behind though and volume can still be adjusted. If you add Pan now it will show up when A is pressed to show automation. But not when tracks are normal. (i.e. not automation view)
The track list can be expanded (very top left corner, those little horizontal lines) This buss can now be hidden or revealed at will.
(both in mixer and arrange window though, so probably best left viewed)