The maximum number of eigenvalues is set on the "Advanced" tab. You want to change the value of "Frequency Array Spaces".

If you set this too high, and you encounter an abort, then go to the "Configuration Module" and allocate more memory to CAESAR II. Don't allocate more than half of your physical RAM, or you'll slow down the machine to a point where it won't be usable.

Set your "Frequency Cut Off" to 3500, and the "Number of eigenvalues" to extract to 0.