if you dont have this box right of the 500, then you are just using a different setting for your search. So enter 99999 instead of leaving the field empty
To access F4 settings, either select menu Help > Settings in the menu bar, or use contextual menu "Personalize" from any hit list and choose tab "Settings for all F4 helps":
What is your current display setting there? is it Control (amodal) or Dialog (modal)? when you change this to the other one then you will see the unlimited box