We're updating the status of this idea to more accurately reflect its current status with our engineering team and also made slight changes to the subject line in order for it to be more easily found. We do not have any updates to share surrounding any changes to how images display on mobile devices but you can resize your larger images to appear smaller:
To resize an image:
Open the image editor
Select the Transform tool on the upper left
Check the checkbox marked Lock Resolution, on the lower left
Set the width to a smaller number, such as 200
Hit the Tab key on the keyboard. The Height number will change in response, to resize the image while keeping the original dimensions
There is also a Knowledge Base article that includes a visual walkthrough on resizing images for mobile devices.
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