Designing a full-sized game for a five-inch screen is all about smart...

https://rowansnewwords.tearosediner.net/how-do-i-design-a-slot-ui-that-works-in-both-orientations

Designing a full-sized game for a five-inch screen is all about smart priorities, not just shrinking everything down. You focus on touch-first controls that feel natural in your hands. You choose portrait or landscape based on how players hold the device