Mojave: how do I preview small images in full screen mode in "Preview" app?

In previous OS versions you could preview even small images full screen. If you selected a bunch of images with the Preview app, even small images could be zoomed full screen just by hitting the "option" key, hitting once to preview an image full screen, hitting "option" again to preview the same image at actual size. Has this been removed in Mojave? Or is there a keyboard shortcut that allows you to toggle full screen/actual size any image among a bunch of selected images in Mac's Preview app?