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Using Compose UI on desktop, web, Android and iOS. How do I force everything to fit on one "screen" with no scrollbars or anything; and fit-to-screen?

(I have a bunch of: inputs; an image; and buttons. Currently fits well on Android and iOS but not desktop or web)

Different layout based on screen size. Maybe take a look a material design concepts <https://m3.material.io/foundations/layout/applying-layout/window-size-classes>

Though on Android, I would be very skeptical, that everything will fit on one screen. With all the display and font scaling, you often need some sort of scrolling.