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What do you do when the bezels on your phone are already very slim? Well, not much. This side-by-side comparison of screen protectors meant for the Galaxy S8+ and Galaxy S9+ shows barely any difference. Okay, the bottom bezel appears slightly smaller so the new phone could be a millimeter or two shorter (hard to tell from this angle). But height is the less important direction - the 18.5:9 screen already made the phone pretty tall, a millimeter more or less doesn't matter all that much. Screen protector for the Galaxy S8+ (left) and Galaxy S9+ (right) And there's not much to do...
Source: https://www.gsmarena.com/galaxy_s9_bezels_will_be_only_slightly_thinner-news-29002.php