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You can see the info box at right, where some basic info about the asset is summarized. (you can click on the box to change the shown info)
Right Panel
In the right panel, you have Use Proxy button. You can change between proxy (if there is one available for the particular asset) and hi-res version of the video asset with this button.
You can change the thumbnail for the asset with Create Thumbnail from current frame. You can also add frames to the storyboard of the asset with Add SB button. This button will be inactive if the asset has no storyboard.
You can change the aspect ratio for the image or add a letter box from the drop-down menu
You can zoom in and out the image in the viewer screen from the drop-down menu
With the lock button - bottom of the right panel, you can lock the Viewer against changes
You see the audio controls at right-bottom corner, where you can change audio volume, mute and set left-right balance for the asset