Opening images when reviewing -feature request-

Try checking this: Styling & HTML - Anki Manual

In short, by adding the following code to the styling section of your template, you should be able to change the size of the image when zooming on desktop.

img {
  max-width: none;
  max-height: none;
}

Edit: you could also try using the following code (add it to the styling section). It allows you to zoom an image after clicking on it. The image remains zoomed as long as you do not move the mouse away from it.

html:not(.mobile) img:hover {
  cursor: zoom-in;
  transition: .5s;
  transition-delay: 180s; /* How long before the image automatically zooms out */
  transition-property: -webkit-transform;
  -webkit-transform-origin: 0% 0%;  /* Set image position */
  -webkit-transform: scale(1); /* Set image size after auto zoom out */
}

html:not(.mobile) img:active { 
 cursor: zoom-out;
 -overflow: auto; /* Enable scroll if needed */
 transition: 0s;
 transition-delay: 0.05s;
 transition-property: -webkit-transform;
 -webkit-transform-origin: 0% 0%; /* Set image position */
 -webkit-transform: scale(2.5); /* Set zoom value */
}
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