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I don’t think you have the ability to change these manually but if you hold an option you can click suggest less. There’s a way to disable it and it’s in this article: https://www.makeuseof.com/how-to-enable-or-disable-contact-suggestions-in-iphone-share-sheet/
Apple thinks they know you best, so they control it, not you. They’ll hopefully update the share pop up in iOS 18