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After selecting some images and pressing ≪Spacebar≫, I click on the index button:
This is what I see:
Without the keyboard (Ctrl-Enter), how do I get back to the unindexed view?
On 10.13.2 a single click on any image returns to Quick Look on just that image, as hover on any image highlights with a blue rectangle.
Testing it on 10.13 it seems you have to double click on the image you want to return to the full size preview of.