The Filter column in the layer pane is the layer filter. By default, results of all layers are displayed. The color of the box around the check mark for a layer indicates the highest severity of results found in the layer for the selected category.

For example, to view results from only outer layers, remove the check mark from the inner signal layers—in the example that would be layers sig2, sig3, and sig4.
As you view the results, they are automatically flagged as viewed.
If you leave
a group of results, without viewing all of them, the viewed column
indicates the proportion of results already
viewed. For example,
indicates that a quarter
of the results have been viewed, and
indicates
that all results have been viewed.