Do you speak about "History Size" property (Options > Miscellaneous > Terminal > History Size)?

This is about "Preferences > Miscellaneous  > output"
The window that always come when there build or clean & Build or Run or Debug!!

(In reply to beans4lad from comment #2)
> The window that always come when there build or clean & Build
It is true

> Run or Debug!!
By default in most cases C++ IDE uses "Internal Terminal" and it is "Preferences > Miscellaneous  > Terminal"

Therefore in this case:
#include <stdio.h>
#include <unistd.h>

int main()
{
   int x;
   for (x = 0; x < 7000; x++) {
      printf("Step %d\n", x);
   }
   sleep(1);
}

I see 5000 lines only. But "History Size" property will fix this problem and I will see all 7000 lines.