Viewing Photos Full Screen on the 11" iPad Pro ? How is it Possible ?

Hi Guys,

I have the 2018 11" iPad Pro and I have a question about viewing photos on this iPad Pro. My question is, this iPad Pro has a screen display aspect ratio of (2,388 x 1,668) so if I want to view a Particular Photo full screen on this iPad Pro, when I say Full Screen I mean in Landscape Mode but a Photo which occupies full screen from edge to edge both Horizontally and Vertically but in Landscape Mode. So what aspect Ratio should I click my Photos graphs into ?

Also if for some reason if I am not able to click the Photographs already in the 11" iPad Ratio, if I take the Photos in any other aspect ratio and later Upscale or downscale using Photoshop or Affinity to the iPad Pro Aspect Ratio will that way will I be able to view those photos Full Screen (Edge to Edge) on the 2018 11" iPad Pro ?

And what if I want to have the same process on the 2022 12.9" iPad Pro ?