At the moment we don’t have a way to filter the results by top level pathway, or diagram-level pathway or other criteria. This feature is on our radar to implement. 

In the meantime, you can get a sense of this as follows:

• Click on the ‘Analysis’ tab in the Details panel (below the pathway diagram window- the Analysis tab should be open by default after performing analysis). 
• To the left of the Details panel, click on the ‘Download’ button.
• Click on the “Pathway analysis results”. This gives the analysis results for all pathways, and for higher-order pathways the columns "Entities found" and "Entities total" contain the aggregated results from the sub-pathways. 
• Import the results into a spreadsheet. Although we don't have a column "Pathway level" or similar, which would allow you to filter for only top level pathways, if you sort the pathways by decreasing "Entities found", you get a good view of the top level, and thus typically (but not always) largest pathways.