The Matrix Information View

It is an information view for matrices.
It shows a brief description of the matrix:

the matrix name/package.
its type.
its size.
a comment if the user wrote one in the comment dialog.

Then in the expression explorer it shows the expression in terms of function calls that has as result the given matrix.
In other words the expression is composed by the function that has as result this matrix with all its input matrices.

Clicking on one of the matrices, that are displayed as links, the matrix itself is expanded to show the expression that generated it.
You can expand each link until the expression becomes only composed only by functions and base matrices.
Clicking on the Back button over the expression shows the expression as it was before the last expansion.
Also, to keep the expression short, only the names of the functions and matrices are displayed. Clicking on the Package button over the expression toggles between showing their name-packages and simply their names.

Under it there are the lists of related project items:

all the functions that use this matrix as input or output matrix. There is a popup menu in the functions list to edit the selected function or get information about it.
all the charts showing it. There is a popup menu in the charts list to edit, view the selected chart or get information about it.
all the presentations showing it. There is a popup menu in the presentations list to edit, view the selected presentation or get information about it.