If you have messages set to use an attached message box, the results windows can't stay maximized if a message happens ...
When a message occurs, the maximized window changes to allow for about 12 lines at the bottom. The rest of the screen is entirely occupied by the results window.
When you run again later, the program remembers this "almost maximized" state.
This was true for the 5 or 6 tools I tried .
With messages set to use normal windows dialogs, some of the results windows behave as Brian49 says …