Hi @SynthED, we would prefer to keep the community in English so the most number of users can understand and participate in the discussion. You might try to split your post in two sections: 1) The first one with the auto-translated text and 2) the second one with your Spanish text.
For English-speakers: This feature request is about showing the “Replace Color” preview in the main canvas + the same “Preview” window (because the main canvas might be with big zoom-in to use the eyedropper).
Another possibility would be to be able to move/zoom the main canvas to change the preview area, which I think might be useful in other cases too.