Adjusting aspect ratio on Image Block 7.1

Hello!

I'm new to using Squarespace, but multiple searches have come up empty in relevance to my issue: 

I'm on Squarespace 7.1 and I'd like to change the aspect ratio being used on my image in my Image Block. The design it's in is 'Inline.' I tried cropping the image on my own and re-uploading so it already had the desired aspect ratio, but once I hit 'Save' it just reverts back to a narrower aspect ratio. I looked in 'Image Blocks' under 'Design' to see if I could adjust it here, as suggested by the official Squarespace help pages, but there's nothing here about 'Inline' - and there's nothing about aspect ratios, either. The only adjusting I see on the actual image itself is going into 'Image Editor,' where it does allow me to crop to a desired aspect ratio, but still reverts to the same unwanted ratio when I hit 'Save.' Please help!

Becca