problem foto

I can not make a photo so that after the photo it is displayed in full screen. Such a Full function is available on Samsung phones, I don’t understand why this is not on the iphone 13. At the same time, you have photos on all sites that seem to have this function. Please advise how to do this? Because it's very beautiful.

photo taken in 16:9 mode.

I don't know how to make a photo so that it is in full screen

but what I have attached is 16:9, and this mode is also not full screen. And I want the photo to be full screen without cropping the photo