I am displaying several detached grids together.

Below is an example of the main Grid (ToDo) and one of the detached Grids (Inbox).
I am often believing that the main Grid is active, while it is not, and I make changes to the wrong Grid, which is active (e.g. the Inbox).

The Inbox grid is active as indicated by the orange highlight.
However, there is no indication when the main ToDo Grid is active (apart from the fact that none of  detached Grid have the orange highlight)

Could the main grid please also have some indication that it is active?

p.s. What is the correct terminology to use here? Are "Main Grid" & "Detached Grids" correct? I believe it is different from the case when we have panes which are copies of Grids in a view.