In most image editors you simply select 100% zoom.
100% means that one pixel in the image corresponds exactly to one pixel in the display. At less then 100% more than one image pixel is condensed into one display pixel. At more than 100% each image pixel is expanded into more than 1 display pixel.
What do you want to see here? To my ears a 100% crop is the full image on screen, with the scaling somewhat arbitrary in order to fit your screen dimensions.
But in your last message, you seem to be asking about looking at the pixels 1:1, the image scaled such that each pixel on the screen corresponds to a pixel in the image.
In any case, your software should have a menu command to do either of these, or even a key-combination "shortcut" that can get you there in a keypress.