Click the Filters button and on the General tab set the "position off the button" to Between 4 and 7, and click Add Selected to Filters. Click to select the newly added filter in the list on the right and click the 'NOT' Selected button below it to filter out the selected positions.
I just recognized that I accidentally posted this question in the Forum for Pokertracker 3 but it was for Pokerracker 4. I' m sorry. Have I go to Filter > add filter >hand details > player position > preflop, and then set the numbers between 4 and 7?