In LaTeX, you can use subfigures to display images side by side. However, this does not fit all display configurations. Responsive image grids work as if each image was a letter in a paragraph, which has a minimum size. Considering this constraint, if all images do not fit on a single row (or a fixed grid, for that matter), images flow in the content like text flows in a text container.

The images below show the same image grid on desktop and mobile :