This is not really a WordPress issue, you will have to play around with the CSS to get the layout you desire, if you take a look at isotope.js library you will see that hey have documentation on how to display Masonry grid https://isotope.metafizzy.co/layout-modes/masonry.html , and if that doesn’t fit your needs you can learn more about Flexbox and do it yourself with some custom classes. https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Flexible_Box_Layout/Aligning_Items_in_a_Flex_Container
