It is done to avoid obscuring the current match line, and there is not an option for keeping the Mini Find from moving. For larger files, it does attempt to scroll to center result below the Mini-Find rather than moving the form itself. It is however problematic for small files that fit entirely within the editor control or when match is on the first few lines and are not able to scroll any further. There is a key-binding for every control on the form to avoid using the mouse, the forward and back arrows for example are bound to the matching Find-Next and Find-Prev command.
