How ever many drawers there are, i would always say. I can't help with the website, but upper right would indicate to me anywhere in the top right quadrant of the screen. Upper is a comparative form, so if somebody left their keys in the upper drawer, i'd expect there to be only two drawers.
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The upper part of some upper garments (such as a shirt or jacket) that folds back at or near the neck to give the appearance of a collar.
Maybe upper garment isn't a.
Top right would mean at the top of the screen on the right. I was just asking me a question, i was writing in english and i use for a moment the words 'upper' and 'lowest'.