Final answer:
Pressing CTRL Keypad +/- in the Edit window with the F8 (Grabber) tool active and a highlighted region adjusts the magnification level of the area.
Step-by-step explanation:
When the F8 (Grabber) tool is active and a region (Clip) is highlighted in the Edit window, pressing CTRL Keypad +/- adjusts the magnification level of the highlighted area. The CTRL Keypad + increases the magnification level, making the region appear larger, while CTRL Keypad - decreases the magnification level, making the region appear smaller. This feature is useful for focusing on specific details or adjusting the view for better editing precision.