How to deselect blue selection?

How can I deselect this one pixel with blue frame? :с

It is a cut which you should be able to right click and remove (maybe with the cut tool activated)

Use the Slice tool (Shift+C key) and right-click that rectangle to delete it:

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Or you can hide all slices with View > Show > Slices menu option.

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Para que serve as fatias?