all-grid’s default is to use object-fit: cover; on images; they try to honour the original proportions of the image.
If the specified grid width is a percentage of the window width, the proportions of the image adjust to suit.
You can override this behaviour by adding a class to the image shortcode e.g. <txp::figure class="a_image--contain" />.
Further class additions could be specifying common ratios, caption-visibility, and viewport-height-limitation.
