Adding image attachments to the description field in a next-gen project always has the image appear to the full width of the screen. There is no way to adjust the size of that image as it appears in the description. This is possible to do in classic projects, either with the thumbnail or other img tags (width, height, etc).
Implement some way to let end users that can edit the description the ability to resize in-line image attachments that appear there.
Not all images are created equally. Some of these are very large, or mis-porportioned in a way that makes them appear undesirably large on the page. In the current setup, all images are treated exactly the same
None currently possible within next-gen projects