Hi. What I have in settings when accessed in photo mode is.
Intelligent Features - Scene optimiser, shot suggestions, flaw detection.
Picture - Motion photos, hold shutter button, save options.
Videos - Rear video size, front video size, advanced recording options, video stabilisation
Useful features - HDR rich tone, tracking auto focus, grid lines, location tags, camera modes, shooting methods, storage location, quick launch, quick review,
I compared with a friends note 8 also running android pie and that had the options to change picture size in the settings.
Is this a software issue s10+ or are they hidden somewhere else in a sub menu?