In Explorer, the Navigation reports can be segmented on a portion of your population in order to narrow your datasets.
The only segmentation scope available in the Navigation reports is the Visitor segmentation. For instance, in the follwoing screenshot, we focus on all the visits of the visitors who never converted on the analysed period. Pay attention to the segment description in the orange banner.
In the second example below, we focus on all the visits of the visitors who came to the site at least once using a sponsored link (SEA). This segmentation is different from the Visit segmentation which would have filtered to display visits from sponsored links only.