You can hide the Ribbon to provide more working area in the Reflection window.
To hide the Ribbon
Click the Quick Access Toolbar menu.
In the menu list, choose Minimize the Ribbon.
NOTE:You can display the Ribbon by clicking the Quick Access Toolbar menu button and then choosing Maximize the Ribbon.
If you are using a default 3270 or 5250 keyboard map, you can press CTRL+F1 to hide or display the Ribbon.