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Sorry for not being able to explain correctly

1) Initially, the images changed in size

2) Then you change the height of the image, then the large image is cropped

3)Please tell, whether it is possible to make that the thumbnail of the image in shop was the fixed size for example (800х800px). And the image itself was not cropped but adapted to the specified size of the store’s thumbnail?

Sorry for the inconvenience, thank you for your understanding and help!