No problem.
At the top of the ranking table you should see a text box above each column. These can be used to filter the data.
with top 3 selected if you enter the nationality 3 letter code, eg GBR for Britain, this will show the top 3 athletes from the selected country and highlighted whether or not they have the standard (green) or are within the quota (blue).
With show all ticked and again entering the nationality three letter code this will show all athletes in the world rankings from that country, with those with the qualifying standard highlighted in green at the top of the list.
Hope this helps. I really should write a user guide one day!