The left hand menu on the Roku home screen on all my Rokus is fully visible with room to spare.
But using the controls on my tv, not my Roku, I can zoom the picture out such that the center of the image is shown, but stuff on the left, right, top, and bottom is lost.
See if this is your situation. The picture size controls on tvs from different manufactures may be named differently. My Samsung uses "P.SIZE", my JVC uses "WIDE", I've seen "ZOOM" and "ASPECT RATIO" used on others. Look for these or something similar.
Note that on many sets, this can be set for each separate input option.
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