There is only 1 checkmark for "Show only routes with blocked seats" that shows both flights with blocked seats and also flights with blocked cargo.
There should be 2 separate checkmarks, one for pax, and one for cargo to allow better filtering.
Example of a problem: systems automatically blocks cargo where there is no cargo demand on passenger flights. But then, looking for flights where I am looking only for blocked seats gives me all the routes that have blocked cargo.