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You can try moving the conversion dialog (window) all the way to the Top and Left.


The vertical height is adjustable. drag the top
edge (double arrow pointer) down , then move the windows (regular pointer) titlebar UP

Change your screen resolution to higher numbers (eg 1024x768 => 1280=>720)
BTW
OK is the default action. So just use the
Enter key from almost any field other than comments.